x402 List

x402 Protocol Service Directory

●

nsgoods — verifiable x402 oracle suite

Verification PAYMENT-READY

payment-ready until 2026-09-09

Signed, verifiable pay-per-call x402 oracles for AI agents, settling in USDC on Base and Solana. Every paid answer is ECDSA-signed and appended to a public, tamper-evident hash chain, so an agent can verify authenticity before trusting it. On this domain: signed Solana settlement verification and signed monitoring of any x402 endpoint (Watchdog). Free signed preview on every service.

Pay from $0.01 to $5.00 in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.

measured since 2026-06-05 (start of our harvest window) · $0 all-time · last settled 2026-09-02

BASE URL https://x402.nsgoods.org │ WEBSITE https://x402.nsgoods.org │ ENDPOINTS 2 │ NETWORK Base │ ASSET USDC │ MEMBER SINCE 2026-09-02 │ MONITORED SINCE 2026-09-02

VERDICT

ranking generation 3

solid 85/100 #36 of 64 in Verification by measured score

What the score read on this service: status online, 100% uptime 24h (no 30d window yet), 1253ms response p95, x402 compliance 14 of 14, $0.01 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 Verification, 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 64 listings, this one among them. That set is wider than the 64 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 VERIFICATION

Other Verification 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
Rubric Protocol — Post-Quantum AI Attestation strong 99 100% ---
LION — Verified Company & Compliance Data strong 99 100% ---
scvd.store — evidence observatory for the x402 economy strong 97 100% ---
Hermes Plant strong 96 100% ---
probe402 strong 96 100% ---
5 of 63 other ranked services in Verification

ASSESSMENT

updated 2h 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
-
uptime 7d
-
uptime 30d
-
uptime 90d
-
response p95
1253ms
avg response
1253ms
total checks
1

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 $0.01 to $5.00 (p45 in Verification)
price (min)
$0.01
price (max)
$5.00
category percentile (min)
p45 in Verification
category percentile (max)
p93 in Verification
endpoints / prices
2 / 2
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
-
registrar
-
hosting
custom
domain created
---

Identity facts, not a risk score.

traction $0.00 30d · 0 buyers
volume 30d
$0.00
buyers 30d
0
settlements 30d
0
measured since
2026-06-05 (start of our harvest window)
last settlement
2026-09-02
top buyer share
-
trend 7d vs 30d
-
networks
eip155:8453
volume all-time
$0
settlements all-time
0
median settlement 30d
-
max settlement 30d
-
settled via
-

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.

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 /settle $0.01 Base USDC header
GET /watchdog/register/paid $5.00 Base USDC header
2 endpoints

REQUEST / RESPONSE EXAMPLE

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

// request
curl -i 'https://x402.nsgoods.org/settle'
// 402 response (captured by monitor) · 2 payloads · click to expand 
[
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xc87a06DEE4c0E85912296002617120BBfd5EF990",
        "amount": "10000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://x402.nsgoods.org/settle",
      "mimeType": "application/json",
      "description": "Signed Solana settlement verification (did tx credit amount of mint to payee)"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "tx": "5ygvXjuYao3MtHQkWzBvgXxjg9vWAoG6rMM6qVjPDLym1Qi3MtaGaWBS2hpMCp56TW7yUpP7pqaimBb6LiLTiiGu",
              "mint": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
              "payee": "8SfS2XEedD595GqpNGjgYpRhSAUidThXQHznExpbDwEX",
              "amount": "415803"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "slot": 0,
              "chain": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
              "signer": "0x57fF0F084Cba33e6761503f90eEF0Da9F159350c",
              "verdict": "VERIFIED",
              "signature": "0x00",
              "commitment": "finalized",
              "schema_version": "settle_v1"
            }
          }
        },
        "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",
                    "HEAD",
                    "DELETE"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "type": "object",
                  "required": [
                    "tx",
                    "payee",
                    "amount"
                  ],
                  "properties": {
                    "tx": {
                      "type": "string",
                      "description": "Solana transaction signature (base58)."
                    },
                    "mint": {
                      "type": "string",
                      "description": "SPL mint (default USDC EPjFWdd5...)."
                    },
                    "payee": {
                      "type": "string",
                      "description": "Solana address expected to be credited."
                    },
                    "payer": {
                      "type": "string",
                      "description": "Optional: address expected to be a signer."
                    },
                    "amount": {
                      "type": "string",
                      "description": "Expected atomic units of the mint credited to payee."
                    }
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object",
                  "required": [
                    "schema_version",
                    "verdict",
                    "chain",
                    "signer",
                    "signature"
                  ],
                  "properties": {
                    "slot": {
                      "type": [
                        "integer",
                        "null"
                      ]
                    },
                    "chain": {
                      "type": "string"
                    },
                    "signer": {
                      "type": "string"
                    },
                    "verdict": {
                      "enum": [
                        "VERIFIED",
                        "REFUTED",
                        "UNCONFIRMED",
                        "NOT_FOUND",
                        "not_evaluated"
                      ],
                      "type": "string"
                    },
                    "signature": {
                      "type": "string"
                    },
                    "commitment": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "schema_version": {
                      "type": "string"
                    }
                  }
                }
              }
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xc87a06DEE4c0E85912296002617120BBfd5EF990",
        "amount": "5000000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://x402.nsgoods.org/watchdog/register/paid",
      "mimeType": "application/json",
      "description": "Paid Watchdog registration: 30 days of signed monitoring for one x402 endpoint"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "channel": "https://hooks.example.com/wd",
              "endpoint": "https://api.example-seller.com/x402/quote"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "tier": "paid",
              "type": "registration_receipt",
              "digest": "ca96e3d0aaf1f883506aa90b2f3057289bd1b6141bed5b6966b2468024f24039",
              "signer": "0x57fF0F084Cba33e6761503f90eEF0Da9F159350c",
              "endpoint": "https://api.example-seller.com/x402/quote",
              "manifest": {
                "url": "https://x402.nsgoods.org/proof/index.json",
                "entry": "watchdog"
              },
              "signature": "0xf3c3c2980b877607fa85b5272e3b08cff9b37c711e297104ee1495a543f3189d42fec365153d6f9b912ae80308e4fd26803c92b6e10514ead21bf4147a5c3d811b",
              "expires_at": "2026-10-01T12:04:00+00:00",
              "channel_ref": "78e41ddd041f503681dc9aade1dfa0644953e4791c4dbd3027d311d5d930bb3c",
              "limitations": [
                "monitoring begins at verified_at; changes before it are not covered; free tier is one endpoint per verified channel and cannot be swapped without a paid registration in v1"
              ],
              "verified_at": "2026-09-01T12:04:00+00:00",
              "channel_type": "webhook",
              "registered_at": "2026-09-01T12:00:00+00:00",
              "schema_version": "watchdog_v1",
              "subscription_id": "sub_paid_demo",
              "alert_types_enabled": [
                "endpoint_unreachable",
                "endpoint_recovered",
                "verdict_degraded",
                "verdict_restored",
                "payto_changed",
                "networks_changed",
                "asset_changed",
                "self_inconsistent_402_detected",
                "listing_disappeared_from_catalog"
              ],
              "verification_status": "verified"
            }
          }
        },
        "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",
                    "HEAD",
                    "DELETE"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "type": "object",
                  "required": [
                    "endpoint",
                    "channel"
                  ],
                  "properties": {
                    "channel": {
                      "type": "string",
                      "description": "email address or https webhook URL for alerts."
                    },
                    "endpoint": {
                      "type": "string",
                      "description": "https x402 endpoint URL to monitor."
                    }
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object",
                  "required": [
                    "schema_version",
                    "type",
                    "tier",
                    "signer",
                    "signature"
                  ],
                  "properties": {
                    "tier": {
                      "type": "string"
                    },
                    "type": {
                      "type": "string"
                    },
                    "signer": {
                      "type": "string"
                    },
                    "signature": {
                      "type": "string"
                    },
                    "schema_version": {
                      "type": "string"
                    }
                  }
                }
              }
            }
          }
        }
      }
    },
    "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/nsgoods-verifiable-x402-oracle-suite/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
09-02 · uptime 100.0% · 840ms avg09-0209-02
30d UPTIME 100%
RESPONSE TIME
09-02 · 840ms avg09-02 · 840ms avg09-0209-02
AVG RESP 764ms
PRICE (captured 402, USD)
building price history ($2.505)

Median across 2 endpoints. Use the selector to isolate one.

SUB-SCORES (uptime + x402 compliance)
building assessment history (1 day so far)

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

VOLUME (on-chain settlement, USD)
08-12 · $0.0108-13 · $0.0108-14 · $0.0108-16 · $0.0108-17 · $0.0108-18 · $0.0208-19 · $0.0108-23 · $0.0308-24 · $0.0108-25 · $0.0508-26 · $0.0208-27 · $0.0308-28 · $0.0308-29 · $0.0208-30 · $0.1008-31 · $0.0209-01 · $0.0709-02 · $5peak $508-1209-02
DISTINCT BUYERS
08-12 · 1 buyer08-13 · 1 buyer08-14 · 1 buyer08-16 · 1 buyer08-17 · 1 buyer08-18 · 1 buyer08-19 · 1 buyer08-23 · 1 buyer08-24 · 1 buyer08-25 · 2 buyers08-26 · 1 buyer08-27 · 3 buyers08-28 · 2 buyers08-29 · 1 buyer08-30 · 3 buyers08-31 · 3 buyers09-01 · 5 buyers09-02 · 5 buyerspeak 5 buyers08-1209-02

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-09-02 · last up 2026-09-02

  • 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 (10) live · click to expand
TIME STATUS RESP CAUSE
● OK 423ms
● OK 496ms
● OK 900ms
● OK 656ms
● OK 743ms
● OK 927ms
● OK 1101ms
● OK 466ms
● OK 677ms
● SLOW 1253ms
10 of 10 checks · live count

EMBED THIS BADGE

Show that nsgoods — verifiable x402 oracle suite is monitored on x402-list. Paste this on your site or README, it links back to this live listing.

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

RUN THIS SERVICE?

Keep this listing accurate: propose changes to the name, description, website, category or add new endpoints to monitor. Ownership is verified with a domain proof and every change is reviewed manually; measured data stays read-only.

[ update this listing ]

Earn the verified tier: x402list pays a real call to this endpoint and, if it delivers, the service is delivery-verified. The fee covers the cost of the probe, not the badge; there is no refund if the call does not deliver. Agent and API only, no in-browser signing. See /api.

[ verify this service ($0.25) ]

To request delisting, email info@x402-list.com or update your listing at /services/nsgoods-verifiable-x402-oracle-suite/update.