x402 List

x402 Protocol Service Directory

●

x402engine

AI PAYMENT-READY

payment-ready until 2026-09-18

108 pay-per-call AI and data APIs for agents, including 72 LLMs, image, video, audio, web, code, crypto, wallet, travel, and utility endpoints. Pay per request in USDC on Base, MegaETH, or Solana with no API keys or subscriptions.

Pay from $0.001 to $0.02 per request in USDC on Base / Solana, settled onchain via the x402 protocol, no signup, no API key needed.

measured since 2026-02-07 (start of our harvest window) · $210.49 all-time · settled via coinbase

BASE URL https://x402engine.app │ WEBSITE https://x402engine.app │ ENDPOINTS 13 │ NETWORK Base / Solana │ ASSET USDC │ MEMBER SINCE 2026-07-28 │ MONITORED SINCE 2026-07-28

VERDICT

ranking generation 3

solid 93/100 #2 of 115 in AI by measured score

What the score read on this service: status online, 100% uptime 30d, 324ms response p95, x402 compliance 14 of 14, $0.001 price against the category, on-chain traction measured. Each of those is measured, and each is published in full below.

The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.

It is a score inside AI, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 115 listings, this one among them. That set is wider than the 115 the position above is counted against, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.

Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.

ALTERNATIVES IN AI

Other AI services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).

Ranked alternative x402 services in the same category, with band, measured score, 30-day uptime and 30-day on-chain settlement volume
SERVICE BAND SCORE UPTIME 30D VOL 30D
Otto AI strong 95 100% $48.59
Agent402.tools solid 92 98.8% $126.40
vaaya solid 90 100% $32.89
StableEmail solid 89 100% $33.51
Exa solid 89 100% $47.75
5 of 114 other ranked services in AI · see the whole category

ASSESSMENT

updated 1h ago

The parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.

reliability 100%
uptime 24h
100%
uptime 7d
100%
uptime 30d
100%
uptime 90d
100%
response p95
324ms
avg response
321ms
total checks
2,763

Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.

compliance A (14/14)

14 of 14 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.001 to $0.02 (p10 in AI)
price (min)
$0.001
price (max)
$0.02
category percentile (min)
p10 in AI
category percentile (max)
p31 in AI
endpoints / prices
13 / 6
model
tiered
stability
100%
risk clean

No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.

domain age
213d
registrar
GoDaddy.com, LLC
hosting
custom
domain created
2026-02-08

Identity facts, not a risk score.

traction $17.623 30d · 53 buyers
volume 30d
$17.623
buyers 30d
53
settlements 30d
531
measured since
2026-02-07 (start of our harvest window)
last settlement
2026-09-11
top buyer share
49% of 30d volume
trend 7d vs 30d
0.13x the 30d daily rate
networks
eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
volume all-time
$210.49
settlements all-time
33,809
median settlement 30d
$0.02
max settlement 30d
$0.70
settled via
coinbase ($17.62, 531 tx)

Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.

Top buyer share is a concentration signal, not part of the ranking score.

CHANGES

1 in 30d

Payout, price, and schema changes detected on this service's x402 wire. A payout rotation at an unchanged price shows up here even when nothing else moves. Full feed at /changes.

changes schema changed 6d ago (1 in 30d)

schema changed · 6d ago

schema removed GET /api/crypto/history exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed GET /api/crypto/markets exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed GET /api/crypto/price exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed GET /api/crypto/search exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed GET /api/crypto/trending exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed GET /api/ens/resolve exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed GET /api/ens/reverse exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed GET /api/ipfs/get exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed GET /api/token/metadata exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed GET /api/travel/flights exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed GET /api/travel/hotels exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed GET /api/web/scrape exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema removed GET /api/web/screenshot exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"}

schema added GET /api/crypto/history exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added GET /api/crypto/markets exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added GET /api/crypto/price exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added GET /api/crypto/search exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added GET /api/crypto/trending exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added GET /api/ens/resolve exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added GET /api/ens/reverse exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added GET /api/ipfs/get exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added GET /api/token/metadata exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added GET /api/travel/flights exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added GET /api/travel/hotels exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added GET /api/web/scrape exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

schema added GET /api/web/screenshot exact solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v USDC 2 300 {"feePayer":"Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"}

see all changes for this service

WHAT IT DOES

ai-derived

No AI synthesis has been produced for this service yet.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD PATH DESCRIPTION PRICE NETWORK ASSET 402 CHANNEL
GET /api/crypto/history $0.003 Base/Solana USDC header
GET /api/crypto/markets $0.002 Base/Solana USDC header
GET /api/crypto/price $0.001 Base/Solana USDC header
GET /api/crypto/search $0.001 Base/Solana USDC header
GET /api/crypto/trending $0.001 Base/Solana USDC header
GET /api/ens/resolve $0.001 Base/Solana USDC header
GET /api/ens/reverse $0.001 Base/Solana USDC header
GET /api/ipfs/get $0.001 Base/Solana USDC header
GET /api/token/metadata $0.002 Base/Solana USDC header
GET /api/travel/flights $0.02 Base/Solana USDC header
GET /api/travel/hotels $0.02 Base/Solana USDC header
GET /api/web/scrape $0.005 Base/Solana USDC header
GET /api/web/screenshot $0.01 Base/Solana USDC header
13 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to GET /api/crypto/history returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request
curl -i 'https://x402engine.app/api/crypto/history'
// 402 response (captured by monitor) · 13 payloads · click to expand 
[
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x7dd5Be069f2d2eAd75eC7C3423B116fF043c2629",
        "amount": "20000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0xFAfDdbb3FC7688494971a79cc65DCa3EF82079E7",
        "extra": {
          "name": "USDm",
          "version": "2"
        },
        "payTo": "0x7dd5Be069f2d2eAd75eC7C3423B116fF043c2629",
        "amount": "20000000000000000",
        "scheme": "exact",
        "network": "eip155:4326",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
        },
        "payTo": "Gzehfseq1k9AcHFSoV7qHmDGQx92nLMw78XXdqVWQQWa",
        "amount": "20000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://x402engine.app/api/travel/flights",
      "mimeType": "application/json",
      "description": "Search flights via Google Flights (SerpApi). Returns best flights, prices, airlines, and price insights."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "adults": "1",
              "origin": "JFK",
              "currency": "USD",
              "destination": "LAX",
              "travelClass": "1",
              "departureDate": "2026-04-15"
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method"
              ],
              "properties": {
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "type": "object",
                  "required": [
                    "origin",
                    "destination",
                    "departureDate"
                  ],
                  "properties": {
                    "stops": {
                      "type": "string",
                      "description": "0=Nonstop only, 1=Up to 1 stop, 2=Up to 2 stops"
                    },
                    "adults": {
                      "type": "string",
                      "default": "1",
                      "description": "Number of adult passengers"
                    },
                    "origin": {
                      "type": "string",
                      "example": "JFK",
                      "description": "Departure airport IATA code"
                    },
                    "children": {
                      "type": "string",
                      "description": "Number of children"
                    },
                    "currency": {
                      "type": "string",
                      "default": "USD",
                      "description": "Currency code (e.g. USD, EUR)"
                    },
                    "maxPrice": {
                      "type": "string",
                      "description": "Maximum price filter"
                    },
                    "returnDate": {
                      "type": "string",
                      "description": "Return date for round trips (YYYY-MM-DD)"
                    },
                    "destination": {
                      "type": "string",
                      "example": "LAX",
                      "description": "Arrival airport IATA code"
                    },
                    "travelClass": {
                      "type": "string",
                      "default": "1",
                      "description": "1=Economy, 2=Premium Economy, 3=Business, 4=First"
                    },
                    "departureDate": {
                      "type": "string",
                      "example": "2026-04-15",
                      "description": "Departure date (YYYY-MM-DD)"
                    }
                  },
                  "additionalProperties": false
                }
              },
              "additionalProperties": false
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x7dd5Be069f2d2eAd75eC7C3423B116fF043c2629",
        "amount": "5000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0xFAfDdbb3FC7688494971a79cc65DCa3EF82079E7",
        "extra": {
          "name": "USDm",
          "version": "2"
        },
        "payTo": "0x7dd5Be069f2d2eAd75eC7C3423B116fF043c2629",
        "amount": "5000000000000000",
        "scheme": "exact",
        "network": "eip155:4326",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
        },
        "payTo": "Gzehfseq1k9AcHFSoV7qHmDGQx92nLMw78XXdqVWQQWa",
        "amount": "5000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://x402engine.app/api/web/scrape",
      "mimeType": "application/json",
      "description": "Scrape any URL and get clean markdown content — ideal for extracting readable text from web pages"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "url": "https://example.com"
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method"
              ],
              "properties": {
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "type": "object",
                  "required": [
                    "url"
                  ],
                  "properties": {
                    "url": {
                      "type": "string",
                      "example": "https://example.com",
                      "description": "URL to scrape"
                    }
                  },
                  "additionalProperties": false
                }
              },
              "additionalProperties": false
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x7dd5Be069f2d2eAd75eC7C3423B116fF043c2629",
        "amount": "1000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0xFAfDdbb3FC7688494971a79cc65DCa3EF82079E7",
        "extra": {
          "name": "USDm",
          "version": "2"
        },
        "payTo": "0x7dd5Be069f2d2eAd75eC7C3423B116fF043c2629",
        "amount": "1000000000000000",
        "scheme": "exact",
        "network": "eip155:4326",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
        },
        "payTo": "Gzehfseq1k9AcHFSoV7qHmDGQx92nLMw78XXdqVWQQWa",
        "amount": "1000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://x402engine.app/api/ipfs/get",
      "mimeType": "application/json",
      "description": "Fetch a file from IPFS by CID via gateway"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "cid": "QmYwAPJzv5CZsnA625s3Xf2nemtYgPpHdWEz79ojWnPbdG"
            }
          }
        },
        "schema": {
          "type": "object",
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        },
        "payTo": "0x7dd5Be069f2d2eAd75eC7C3423B116fF043c2629",
        "amount": "10000000000000000",
        "scheme": "exact",
        "network": "eip155:4326",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
        },
        "payTo": "Gzehfseq1k9AcHFSoV7qHmDGQx92nLMw78XXdqVWQQWa",
        "amount": "10000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://x402engine.app/api/web/screenshot",
      "mimeType": "application/json",
      "description": "Capture a screenshot of any URL — returns base64-encoded image, supports full-page capture"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "url": "https://example.com",
              "fullPage": false
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method"
              ],
              "properties": {
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "type": "object",
                  "required": [
                    "url"
                  ],
                  "properties": {
                    "url": {
                      "type": "string",
                      "example": "https://example.com",
                      "description": "URL to screenshot"
                    },
                    "fullPage": {
                      "type": "boolean",
                      "default": false,
                      "description": "Capture full page"
                    }
                  },
                  "additionalProperties": false
                }
              },
              "additionalProperties": false
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x7dd5Be069f2d2eAd75eC7C3423B116fF043c2629",
        "amount": "20000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0xFAfDdbb3FC7688494971a79cc65DCa3EF82079E7",
        "extra": {
          "name": "USDm",
          "version": "2"
        },
        "payTo": "0x7dd5Be069f2d2eAd75eC7C3423B116fF043c2629",
        "amount": "20000000000000000",
        "scheme": "exact",
        "network": "eip155:4326",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
        },
        "payTo": "Gzehfseq1k9AcHFSoV7qHmDGQx92nLMw78XXdqVWQQWa",
        "amount": "20000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://x402engine.app/api/travel/hotels",
      "mimeType": "application/json",
      "description": "Search hotels via Google Hotels (SerpApi). Returns properties with prices, ratings, and amenities."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "q": "hotels in Paris",
              "adults": "2",
              "currency": "USD",
              "checkInDate": "2026-04-15",
              "checkOutDate": "2026-04-18"
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method"
              ],
              "properties": {
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "type": "object",
                  "required": [
                    "q",
                    "checkInDate",
                    "checkOutDate"
                  ],
                  "properties": {
                    "q": {
                      "type": "string",
                      "example": "hotels in Paris",
                      "description": "Search query — city name or hotel name"
                    },
                    "adults": {
                      "type": "string",
                      "default": "2",
                      "description": "Number of adults"
                    },
                    "sortBy": {
                      "type": "string",
                      "description": "3=Lowest price, 8=Highest rating, 13=Most reviewed"
                    },
                    "children": {
                      "type": "string",
                      "description": "Number of children"
                    },
                    "currency": {
                      "type": "string",
                      "default": "USD",
                      "description": "Currency code (e.g. USD, EUR)"
                    },
                    "maxPrice": {
                      "type": "string",
                      "description": "Maximum price per night"
                    },
                    "minPrice": {
                      "type": "string",
                      "description": "Minimum price per night"
                    },
                    "hotelClass": {
                      "type": "string",
                      "description": "Star rating (2-5)"
                    },
                    "checkInDate": {
                      "type": "string",
                      "example": "2026-04-15",
                      "description": "Check-in date (YYYY-MM-DD)"
                    },
                    "checkOutDate": {
                      "type": "string",
                      "example": "2026-04-18",
                      "description": "Check-out date (YYYY-MM-DD)"
                    }
                  },
                  "additionalProperties": false
                }
              },
              "additionalProperties": false
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x7dd5Be069f2d2eAd75eC7C3423B116fF043c2629",
        "amount": "2000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0xFAfDdbb3FC7688494971a79cc65DCa3EF82079E7",
        "extra": {
          "name": "USDm",
          "version": "2"
        },
        "payTo": "0x7dd5Be069f2d2eAd75eC7C3423B116fF043c2629",
        "amount": "2000000000000000",
        "scheme": "exact",
        "network": "eip155:4326",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
        },
        "payTo": "Gzehfseq1k9AcHFSoV7qHmDGQx92nLMw78XXdqVWQQWa",
        "amount": "2000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://x402engine.app/api/token/metadata",
      "mimeType": "application/json",
      "description": "Token/asset metadata — name, symbol, decimals, chain info"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "chain": "ethereum",
              "address": "0xdac17f958d2ee523a2206206994597c13d831ec7"
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method"
              ],
              "properties": {
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "type": "object",
                  "required": [
                    "chain",
                    "address"
                  ],
                  "properties": {
                    "chain": {
                      "type": "string",
                      "example": "ethereum",
                      "description": "Chain name"
                    },
                    "address": {
                      "type": "string",
                      "example": "0xdac17f958d2ee523a2206206994597c13d831ec7",
                      "description": "Token contract address"
                    }
                  },
                  "additionalProperties": false
                }
              },
              "additionalProperties": false
            }
          }
        }
      }
    },
    "x402Version": 2
  }
]

OVER TIME

All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/x402engine/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.

UPTIME
08-13 · uptime 100.0% · 205ms avg08-14 · uptime 100.0% · 298ms avg08-15 · uptime 100.0% · 262ms avg08-16 · uptime 100.0% · 396ms avg08-17 · uptime 100.0% · 360ms avg08-18 · uptime 100.0% · 269ms avg08-19 · uptime 100.0% · 242ms avg08-20 · uptime 100.0% · 258ms avg08-21 · uptime 100.0% · 282ms avg08-22 · uptime 100.0% · 434ms avg08-23 · uptime 100.0% · 375ms avg08-24 · uptime 100.0% · 461ms avg08-25 · uptime 100.0% · 490ms avg08-26 · uptime 100.0% · 487ms avg08-27 · uptime 100.0% · 624ms avg08-28 · uptime 100.0% · 493ms avg08-29 · uptime 100.0% · 329ms avg08-30 · uptime 100.0% · 304ms avg08-31 · uptime 100.0% · 258ms avg09-01 · uptime 100.0% · 248ms avg09-02 · uptime 100.0% · 334ms avg09-03 · uptime 100.0% · 302ms avg09-04 · uptime 100.0% · 315ms avg09-05 · uptime 100.0% · 294ms avg09-06 · uptime 100.0% · 288ms avg09-07 · uptime 100.0% · 335ms avg09-08 · uptime 100.0% · 224ms avg09-09 · uptime 100.0% · 194ms avg09-10 · uptime 100.0% · 226ms avg09-11 · uptime 100.0% · 201ms avg08-1309-11
30d UPTIME 100%
RESPONSE TIME
08-13 · 205ms avg08-13 · 205ms avg08-14 · 298ms avg08-14 · 298ms avg08-15 · 262ms avg08-15 · 262ms avg08-16 · 396ms avg08-16 · 396ms avg08-17 · 360ms avg08-17 · 360ms avg08-18 · 269ms avg08-18 · 269ms avg08-19 · 242ms avg08-19 · 242ms avg08-20 · 258ms avg08-20 · 258ms avg08-21 · 282ms avg08-21 · 282ms avg08-22 · 434ms avg08-22 · 434ms avg08-23 · 375ms avg08-23 · 375ms avg08-24 · 461ms avg08-24 · 461ms avg08-25 · 490ms avg08-25 · 490ms avg08-26 · 487ms avg08-26 · 487ms avg08-27 · 624ms avg08-27 · 624ms avg08-28 · 493ms avg08-28 · 493ms avg08-29 · 329ms avg08-29 · 329ms avg08-30 · 304ms avg08-30 · 304ms avg08-31 · 258ms avg08-31 · 258ms avg09-01 · 248ms avg09-01 · 248ms avg09-02 · 334ms avg09-02 · 334ms avg09-03 · 302ms avg09-03 · 302ms avg09-04 · 315ms avg09-04 · 315ms avg09-05 · 294ms avg09-05 · 294ms avg09-06 · 288ms avg09-06 · 288ms avg09-07 · 335ms avg09-07 · 335ms avg09-08 · 224ms avg09-08 · 224ms avg09-09 · 194ms avg09-09 · 194ms avg09-10 · 226ms avg09-10 · 226ms avg09-11 · 201ms avg09-11 · 201ms avg08-1309-11
AVG RESP 321ms
PRICE (captured 402, USD)
08-12 · $0.00209-11 · $0.002$0.00208-1209-11

Median across 13 endpoints. Use the selector to isolate one.

SUB-SCORES (uptime + x402 compliance)
08-13 uptime: 100.0% compliance: 100% checks08-14 uptime: 100.0% compliance: 100% checks08-15 uptime: 100.0% compliance: 100% checks08-16 uptime: 100.0% compliance: 100% checks08-17 uptime: 100.0% compliance: 100% checks08-18 uptime: 100.0% compliance: 100% checks08-19 uptime: 100.0% compliance: 100% checks08-20 uptime: 100.0% compliance: 100% checks08-21 uptime: 100.0% compliance: 100% checks08-22 uptime: 100.0% compliance: 100% checks08-23 uptime: 100.0% compliance: 100% checks08-24 uptime: 100.0% compliance: 100% checks08-25 uptime: 100.0% compliance: 100% checks08-26 uptime: 100.0% compliance: 100% checks08-27 uptime: 100.0% compliance: 100% checks08-28 uptime: 100.0% compliance: 100% checks08-29 uptime: 100.0% compliance: 100% checks08-30 uptime: 100.0% compliance: 100% checks08-31 uptime: 100.0% compliance: 100% checks09-01 uptime: 100.0% compliance: 100% checks09-02 uptime: 100.0% compliance: 100% checks09-03 uptime: 100.0% compliance: 100% checks09-04 uptime: 100.0% compliance: 100% checks09-05 uptime: 100.0% compliance: 100% checks09-06 uptime: 100.0% compliance: 100% checks09-07 uptime: 100.0% compliance: 100% checks09-08 uptime: 100.0% compliance: 100% checks09-09 uptime: 100.0% compliance: 100% checks09-10 uptime: 100.0% compliance: 100% checks09-11 uptime: 100.0% compliance: 100% checksuptimecompliance08-1309-11

checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression

PILLARS OVER TIME (measured)
price percentile in AI
site signals present (of 6)

Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.

VOLUME (on-chain settlement, USD)
08-13 · $208-14 · $108-15 · $0.8808-16 · $0.4408-17 · $208-18 · $808-19 · $0.0108-20 · $0.0608-21 · $0.0808-22 · $0.1808-23 · $0.0508-24 · $0.5608-25 · $0.0308-26 · $0.0708-27 · $0.2908-30 · $0.0008-31 · $0.0809-02 · $0.7809-03 · $0.5009-04 · $0.0609-05 · $0.0209-06 · $0.1809-07 · $0.0109-08 · $0.1709-09 · $0.0009-11 · $0.11peak $808-1309-11
DISTINCT BUYERS
08-13 · 3 buyers08-14 · 2 buyers08-15 · 1 buyer08-16 · 1 buyer08-17 · 5 buyers08-18 · 5 buyers08-19 · 1 buyer08-20 · 1 buyer08-21 · 2 buyers08-22 · 3 buyers08-23 · 1 buyer08-24 · 4 buyers08-25 · 1 buyer08-26 · 5 buyers08-27 · 2 buyers08-30 · 1 buyer08-31 · 4 buyers09-02 · 2 buyers09-03 · 2 buyers09-04 · 2 buyers09-05 · 2 buyers09-06 · 7 buyers09-07 · 11 buyers09-08 · 5 buyers09-09 · 1 buyer09-11 · 2 buyerspeak 11 buyers08-1309-11

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-09-06 · last up 2026-09-11

  • 402 payload captured
  • accepts[] array present
  • payTo address recoverable
  • payTo at accepts[0].payTo (conformant shape)
  • payTo is a valid on-chain address
  • atomic price declared
  • atomic price in a sane range
  • asset (token) address declared
  • network resolves to CAIP-2
  • payment scheme declared
  • served over HTTPS
  • declares the current x402 version (2)
  • EIP-712 domain parameters present on every EVM entry
  • x402 v2 envelope delivered in the payment-required header

SITE PILLARS

  • homepage reachable
  • openapi doc
  • pricing page
  • llms.txt
  • robots.txt
  • terms page
recent checks (18) live · click to expand
TIME STATUS RESP CAUSE
● OK 210ms
● OK 212ms
● OK 166ms
● OK 265ms
● OK 190ms
● OK 117ms
● OK 151ms
● OK 164ms
● OK 196ms
● OK 194ms
● OK 262ms
● OK 111ms
● OK 348ms
● OK 225ms
● OK 252ms
● OK 209ms
● OK 267ms
● OK 173ms
18 of 2,768 checks · live count

EMBED THIS BADGE

Show that x402engine is monitored on x402-list. Paste this on your site or README, it links back to this live listing.

x402engine listed on x402-list
status
x402engine uptime on x402-list
live uptime
// HTML
<a href="https://x402-list.com/services/x402engine?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/x402engine.svg" alt="x402engine listed on x402-list" height="28">
</a>
// Markdown
[![x402engine on x402-list](https://x402-list.com/badge/x402engine.svg)](https://x402-list.com/services/x402engine?utm_source=badge&utm_medium=referral&utm_campaign=embed)
// HTML · live uptime variant
<a href="https://x402-list.com/services/x402engine?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/x402engine.svg?data=uptime" alt="x402engine uptime on x402-list" height="28">
</a>

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