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XFuel

payment-readyonline

payment-ready until 2026-10-16

OpenAI-compatible paid inference via x402.

xfuel.app ↗

Call it x402 v2

x402 v2

Base URL
https://api.xfuel.app
Payment
x402 v2, header channel
$ curl -i -X POST 'https://api.xfuel.app/v1/chat/completions'

An unpaid request returns HTTP 402 with the payment terms. Sign a payment authorization, then retry with the PAYMENT-SIGNATURE header.

Endpoints 1 paid route on api.xfuel.app

POST/v1/chat/completionsBase+Sol$0.002since 08-25

Prices as captured in the 402 response: $0.002.

Example 402 response

Endpoints and prices

Current paid endpoints; minimum quoted prices in USD where available; first capture dates in UTC
MethodPathDescriptionPriceNetworkAsset402 channelCaptured
POST/v1/chat/completionsNo description$0.002Base+SolUSDCheadersince 08-25

Payment evidence

402 payload captured at . Check evidence JSON · Measurement methodology.

1 payload captured by the monitor.

201 lines, scroll inside

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "nonce": "0x572e74a668da7afe2122106ddbad60a43d352454811aa7e8ed464b81ed713b08",
        "taskId": "xfuel-028ff83f-dde3-4449-a369-241bd7bacd9e",
        "version": "2",
        "expiresAt": 1788361564784
      },
      "payTo": "0x23f713411c30BBd9A989c9cbC22EB0b55F7f7334",
      "amount": "2000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxAmountRequired": "2000",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "nonce": "0xdffcc4b789713b052bceebf06a749b7ac175c09f7ecb615d602720cb8bd6eac1",
        "taskId": "xfuel-028ff83f-dde3-4449-a369-241bd7bacd9e",
        "feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww",
        "expiresAt": 1788361564784
      },
      "payTo": "58Qo8QTJ1Sd4aXSygwAeBLNL3VrXRmfUCceB6b5RJCx6",
      "amount": "2000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxAmountRequired": "2000",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://api.xfuel.app/v1/chat/completions",
    "tags": [
      "llm",
      "openai-compatible",
      "chat-completions",
      "inference"
    ],
    "iconUrl": "https://api.xfuel.app/xfuel-icon.svg",
    "mimeType": "application/json",
    "description": "Paid inference via x402 USDC on Base and Solana. Cost-plus, quoted, receipted. POST /v1/chat/completions is the recommended surface. Returns signed receipt + public verify_url. Paying this host is real mainnet USDC.",
    "serviceName": "XFuel"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "model": "xfuel/auto",
            "messages": [
              {
                "role": "user",
                "content": "Hello"
              }
            ],
            "max_tokens": 500
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "id": "chatcmpl-abc123",
            "model": "xfuel/auto",
            "usage": {
              "total_tokens": 15,
              "prompt_tokens": 10,
              "completion_tokens": 5
            },
            "xfuel": {
              "verify_url": "https://api.xfuel.app/receipt/xfuel-abc123"
            },
            "object": "chat.completion",
            "choices": [
              {
                "index": 0,
                "message": {
                  "role": "assistant",
                  "content": "Hello!"
                },
                "finish_reason": "stop"
              }
            ],
            "created": 1700000000
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "required": [
                  "messages"
                ],
                "properties": {
                  "model": {
                    "type": "string",
                    "description": "Model id from GET /v1/models; xfuel/auto routes automatically"
                  },
                  "stream": {
                    "type": "boolean"
                  },
                  "messages": {
                    "type": "array",
                    "items": {
                      "type": "object",
                      "required": [
                        "role",
                        "content"
                      ],
                      "properties": {
                        "role": {
                          "enum": [
                            "system",
                            "user",
                            "assistant"
                          ],
                          "type": "string"
                        },
                        "content": {
                          "type": "string"
                        }
                      }
                    },
                    "description": "OpenAI-style chat messages array"
                  },
                  "max_tokens": {
                    "type": "integer",
                    "description": "Output token budget"
                  },
                  "temperature": {
                    "type": "number",
                    "maximum": 2,
                    "minimum": 0
                  }
                }
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST",
                  "PUT",
                  "PATCH"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Can I trust it score from our own monitoring

score from our own monitoring

85/100 Solid

#59 of 186 in AI. Bands: strong 93+, solid 75+, mixed 55+, weak below 55.

Reliability
99.9% uptime 30d
Compliance
A 14/14 checks pass
Price
$0.002 p23 in AI
Risk
clean no risk flag
Traction
$0.29 30d 18 buyers, top buyer 68% (address, not entity)
14/14 compliance checks
  • 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

402 terms unchanged since 2026-09-02. Last up 2026-10-09.

── Site signals

  • homepage reachable
  • openapi doc
  • pricing page
  • llms.txt
  • robots.txt
  • terms page
How the score works

What the score read on this service: status online, 99.9% uptime 30d, 1559ms response p95, x402 compliance 14 of 14, $0.002 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.

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.

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 186 listings, this one among them: the same 186 the position above is counted against. When the two differ, the field is the wider one, 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.

Settled via coinbase ($0.29, 56 tx). Traction is a conservative undercount; first settlement seen 2026-08-05.

All measured facts

What it does

OpenAI-compatible paid inference via x402. POST /v1/chat/completions. $0.01 USDC on Base and Solana. Returns a signed public receipt.

XFuel is a listed x402 AI API. Captured payment terms name Base, Solana. Monitoring and settlement figures below describe the observations available to this directory; an unpaid HTTP 402 check does not prove that a paid call will deliver.

Assessment computed at . Latest service check observed at . Service data JSON · Measurement methodology.

Page rendered at . This response time is separate from the observation and computation times attached to each measurement.

Latest endpoint observation: . Latest price capture: . Prices are recorded quotes, not a promise of availability. Token assets and payment terms are listed separately. Endpoint data JSON · Price history JSON · Measurement methodology.

Assessment computed at . Uptime uses the stated daily-rollup window; response times are in milliseconds, compliance is passed/evaluated checks, and traction is a measured settlement floor. The comparison score is out of 100 within this category. Assessment JSON · Measurement methodology.

Observed daily coverage: 2026-09-10 to 2026-10-09 UTC. Daily monitoring and settlement rollups do not expose their computation time; a bucket date is not an update timestamp. Latest settlement in the assessment: . Uptime and response JSON · Volume JSON · Buyers JSON · Measurement methodology.

Ranked from the measured category pool, refreshed at most once a minute. The comparison has no persisted computation timestamp; the assessment time above belongs to this service only. Ranking API documentation · Ranking methodology.

x402 List home · Services · AI

uptime · latest daily rollup
100%
uptime 7d
99.7%
uptime 30d
99.9%
uptime 90d
100%
response p95
1559ms
avg response
630ms
total checks
2,825

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

price (min)
$0.002
category percentile (min)
p23 in AI
endpoints / prices
1 / 1
model
flat
stability
50%

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
301d
registrar
Namecheap Inc.
hosting
custom
domain created
2025-12-09

Identity facts, not a risk score.

assessment volume 30d
$0.29
exact assessment volume 30d (USD)
0.292
assessment recorded at (UTC)
2026-10-09T13:03:02.348Z
buyers 30d
18
settlements 30d
56
measured since
2026-08-05 (start of our harvest window)
last settlement
2026-10-09
top buyer share
68% of 30d volume (address, not entity)
trend 7d vs 30d
0.32x the 30d daily rate
networks
eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
volume all-time
$1.02
settlements all-time
181
median settlement 30d
$0.002
max settlement 30d
$0.102

Assessment volume uses the latest 30d assessment. Over time sums daily address snapshots, rounded to cents and refreshed separately. The two sources can differ in timing, precision and shared-address attribution. Amounts use cents for comparison; known sub-cent values keep up to 12 significant digits. The exact stored assessment value is shown above.

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

Top buyer share is part of the ranking score: a higher share lowers the traction part of the score, by up to half when one address holds all 30d volume.

member since
2026-08-25
Recent checks
Latest 18 unpaid HTTP checks, newest first; response times in milliseconds, observation times in UTC
Checked at (UTC)StatusHTTPResponseEndpoints
Online402286ms1
Online40295ms1
Online402191ms1
Online402200ms1
Online402247ms1
Online402265ms1
Online402622ms1
Online402150ms1
Online402522ms1
Online402290ms1
Online402333ms1
Online402847ms1
Online402360ms1
Online402211ms1
Online402942ms1
Online402479ms1
Online402669ms1
Online402493ms1

Changes0 in 30d

No changes recorded in the last 30 days.

all changes

Over time

On-chain volume daily snapshots, USD 30d: $0.29, peak $0.11 on 09-21
volume no data in the payload
Distinct buyers per dayDistinct buyers per day
Uptime 2 of 29 completed days below 100%
uptime below 100%, to scale
Volume 30d
$0.29
Uptime
2 of 29 completed days below 100%
Daily on-chain settlement volume in US dollars, 2026-09-10 to 2026-10-09; highest day $0.11 on 09-21; 9 days have no data in the payload; distinct buyers per day
More charts
Response time daily average, ms min 312ms, avg 605ms, max 1290ms

09-10 to 10-09* UTC

Scores over time

x402 compliance low 14/14, high 14/14

09-10 to 10-09* UTC

Price percentile in AI own low to high; exact values below

09-10 to 10-09* UTC

Site signals present (of 6) own low to high; exact values below

09-10 to 10-09* UTC

Scores: one day per column, 09-10 to 10-09*, on the columns of Response time. Uptime held below 100% on some days in this window, including any partial day. Daily readings remain in the Uptime strip and Values. The checklist grew from 11 to 14 checks on 2026-07-28, before this window. Pillar lines use their own low and high. Exact dated readings are available in each readout and in Values.

Each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/xfuel/price, /scores, /volume and /buyers.

Values

* today so far, partial (UTC).

The uptime summary counts completed UTC days only. The strip, readouts and table retain today's partial reading.

Daily snapshot total, 30d: $0.24, peak $0.11 on 09-21. The visible 30d total in Traction comes from the latest assessment. These sources can differ in their window, refresh time, cent rounding and shared-address attribution.

Daily address snapshots: 2026-09-10 to 2026-10-09 UTC; * today so far, partial (UTC). Daily snapshots store cents. A recorded $0.00 with settlements cannot distinguish exact zero from volume rounded away. Lost precision is unavailable here. † marks a recorded $0.00 with settlements.

Settlement volume uses the stored USD valuation of tracked payments; it is distinct from token quantities. USD-pegged assets are valued at 1 USD per token in these rollups. The measured settlement floor does not cover all payments to this service.

Assessment history last recorded at . Each UTC day uses its last recorded run; missing readings stay unmeasured. Assessment history JSON · Measurement methodology.

Daily values, 2026-09-10 to 2026-10-09: address settlement volume in USD, distinct buyer and settlement counts, uptime percent, average response milliseconds, compliance passed/total, price percentile 0-100, site signals out of 6; UTC dates
DayVolumeBuyersSettlementsUptimeResponseCompliancePrice percentileSite signals
2026-09-10no datano datano data100%684.36ms14/14p202/6
2026-09-11$0.00 recorded†12100%631.46ms14/14p202/6
2026-09-12$0.00 recorded†12100%554.59ms14/14p202/6
2026-09-13$0.00 recorded†12100%775.31ms14/14p202/6
2026-09-14$0.00 recorded†11100%1290.35ms14/14p232/6
2026-09-15no datano datano data100%1141.06ms14/14p232/6
2026-09-16no datano datano data100%523.70ms14/14p232/6
2026-09-17$0.0136100%320.79ms14/14p232/6
2026-09-18$0.00 recorded†22100%417.89ms14/14p232/6
2026-09-19no datano datano data100%544.34ms14/14p232/6
2026-09-20$0.0811100%468.89ms14/14p232/6
2026-09-21$0.1123100%680.87ms14/14p222/6
2026-09-22no datano datano data100%732.82ms14/14p222/6
2026-09-23$0.00 recorded†12100%543.10ms14/14p222/6
2026-09-24$0.00 recorded†22100%444.83ms14/14p222/6
2026-09-25$0.00 recorded†22100%397.28ms14/14p222/6
2026-09-26$0.0127100%311.83ms14/14p222/6
2026-09-27$0.02310100%525.93ms14/14p222/6
2026-09-28$0.00 recorded†11100%478.78ms14/14p222/6
2026-09-29$0.00 recorded†11100%441.70ms14/14p212/6
2026-09-30no datano datano data100%507.97ms14/14p222/6
2026-10-01$0.00 recorded†11100%436.96ms14/14p222/6
2026-10-02$0.00 recorded†11100%405.17ms14/14p222/6
2026-10-03$0.00 recorded†11100%380.91ms14/14p222/6
2026-10-04no datano datano data100%768.52ms14/14p222/6
2026-10-05no datano datano data100%761.43ms14/14p232/6
2026-10-06no datano datano data98.89%987.71ms14/14p232/6
2026-10-07$0.00 recorded†11100%654.39ms14/14p222/6
2026-10-08$0.015698.89%838.10ms14/14p232/6
2026-10-09*$0.00 recorded†12100%487.98ms14/14p232/6

Alternatives in AI

Cluster Protocol strong 99/100 100% up 30d $55.7k 30d
x402engine strong 95/100 100% up 30d $45.56 30d
GlianaAI strong 94/100 100% up 30d $78.48 30d
NetIntel strong 94/100 100% up 30d $20.14 30d
Agent402.tools solid 93/100 99.8% up 30d $155.87 30d

5 of 185 other ranked services in AI, ordered by the same measured score.

see the whole category

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