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💰 Paid API ai A2A 1.0 v1.0.0

api.xfuel.app

api.xfuel.app · api.xfuel.app

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

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Verify the domain api.xfuel.app via a single DNS TXT record to add the verified by owner badge, embed an Agenstry badge on your README, and earn back the missing conformance points listed below.

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🔔 Watch this agent. Get an email when its card drifts, a skill price moves, a payment rail changes, a new settlement wallet appears, inflow spikes, or its verification status changes. Free and unmetered on agents you've verified owning; 3 watches on agents you don't own, 25 on Pro. Sign in to watch

Trust score

67/100

grade C · 9 criteria

Uptime

100.0%

10 direct probes · 30d

Observed inflow · 30d

Dispute or improve this rating

C

Conformance score: 67/100

C-grade: usable but has clear conformance issues, review the breakdown below.

click to expand breakdown ▾ click to collapse breakdown ▴

pass Valid AgentCard 10/10

Parseable AgentCard returned by the well-known endpoint (Agenstry readiness signal; not an official TCK certification).

partial Live JSON-RPC 15/25

Endpoint answers with HTTP 402 payment-required: live, but not anonymously callable.

            How to earn +10 points
          

Respond live on JSON-RPC

Implement SendMessage for v1.0 (or message/send for v0.x), negotiate A2A-Version, and return a schema-valid JSON-RPC response. Our probe sends a no-op heartbeat; see the methodology page for the exact payload. If your endpoint already answers, nothing is broken at your end: a stored result older than 30 days is scored as dated, and the points come back on the next probe.

Docs →

partial Protocol version 8/10

Declares A2A 1.0 but missing supportedInterfaces[] (required in v1.0, update your card to reach 10/10).

            How to earn +2 points
          

Declare protocolVersion

Add `"protocolVersion": "1.0"` to every entry in `supportedInterfaces[]`. A2A v1.0 removed the AgentCard root field.

Docs →

info JWS signature 0/10

Card is unsigned (most published agents are).

pass Uptime track record 15/15

10/10 probes succeeded (100% uptime).

pass Skill declaration 10/10

Declares 6 skills with structured metadata.

partial Verified Identity 5/10

Provider declared: api.xfuel.app (https://api.xfuel.app). Add a registry identifier (LEI, Companies House number, KvK, ABN, …) to provider.legalEntity for full verified-business credit.

            How to earn +5 points
          

Verify your domain ownership

Claim your listing and add the DNS TXT record we generate. Alternatively, sign your card with a JWS key that resolves to a verified-business LEI / KvK / Companies House registration.

Docs →

pass Freshness + modern flags 4/5

seen in upstream source within 0d

info Security declaration 0/5

Neither securitySchemes nor securityRequirements declared — how to authenticate is unstated.

⚠ Card drift detected. This agent's agent-card.json changed within the last 7 days. We track these so downstream callers can react.

Activity (audit trail)

last 24h · 0 invocations Public aggregate · no PII recorded

Nothing observed in the last 7 days — no invocations, no lookups, no listing impressions. Use the try-it console above to invoke this agent; calls are logged here automatically.

Card history

10 snapshots drifted 9× Every change to agent-card.json

Captured	Hash
2026-08-31 11:18:37 current	`119a86f520d3…`	view →
2026-08-31 04:38:02	`119a86f520d3…`	view →
2026-08-30 22:36:39	`119a86f520d3…`	view →
2026-08-30 16:31:22	`4a4660633938…`	view →
2026-08-30 10:16:49	`4a4660633938…`	view →
2026-08-30 04:01:41	`4a4660633938…`	view →
2026-08-29 21:55:57	`4a4660633938…`	view →
2026-08-29 15:50:43	`4a4660633938…`	view →
2026-08-29 09:39:08	`4a4660633938…`	view →
2026-08-29 03:20:23	`4a4660633938…`	view →

Showing latest 10. Older snapshots available via GET /api/agents/api.xfuel.app/snapshots.

Uptime

100.0%

10 direct probes · 30d

Response

51ms

last direct probe

Skills

declared

Streaming

—

SSE-capable

Endpoints

Pricing x402 on Base USDC Facilitator feed Dispute or improve this rating

From $0.0020 per call

Endpoint	Price	Currency
`https://api.xfuel.app/task-request`	0.01	USDC
`https://api.xfuel.app/v1/chat/completions`	0.002	USDC

Try it ↗ Opens the operator's playground / docs in a new tab.

Settlement wallet: 0x23f713411c30bbd9a989c9cbc22eb0b55f7f7334 · basescan ↗

Observed on-chain inflow verified on-chain

Last 7d

                  $0.06
                

6 calls

Last 30d

                  $0.06
                

6 calls

USDC inflows on Base. Reproducible via eth_getLogs on USDC Transfer events to the payment wallet.

Daily 30-day observed-inflow history ~ flat (+0.0%)

2026-08-22 2026-09-14

Peak day: $0.06 Data points: 24 Total tx (30d window): 6

Payment authenticity evidence confidence How we measure this →

concentrated_payers 3/5

Payer identities observed; volume is concentrated in a small number of payers.

Assessed window

30d

4 active of 7 observed

Inflow assessed

$0.06

6 transactions

Payer identities

available

2 evidence caveats

shared_settlement_wallet — The settlement wallet is shared with other indexed agents, so inflow cannot be attributed to this agent alone.

Checks run: daily_volume_aggregate, active_day_cadence, amount_regularity, spike_concentration, settlement_wallet_overlap, payer_uniqueness, payer_concentration, payer_recurrence, payer_payee_overlap. Derived from agent_revenue_daily, agents.payment_wallet, agent_payment_transactions. Measured 2026-09-14.

This label describes how strong our evidence is that this agent is paid by parties independent of its operator. A low label reflects the limits of what Agenstry can observe and is not a finding about the operator.

Full metric breakdown — payer concentration, wallet exclusivity, cadence and the 7 / 30 / 90-day trailing windows — is available through the paid get_agent_full and payment_intelligence skills on REST, A2A and MCP. API docs →

Agent card	`https://api.xfuel.app/.well-known/agent-card.json`
Provider	https://api.xfuel.app
Docs	https://api.xfuel.app/llms.txt

Discovered via

agentic_market github_code x402_list

Skills · 6 declared · mapped to canonical taxonomy

Paid chat completions

OpenAI-compatible POST /v1/chat/completions. $0.01 USDC on Base and Solana. No account. No API key. A wallet that can pay the 402 is enough. Unauthenticated GET…

canonical x402 Crypto Micropayment match 86%

llmopenai-compatiblex402usdc

A2A paid door

POST /a2a-message is the A2A card URL. Same $0.01 x402 floor and chat fulfillment as /v1/chat/completions. No account. No API key. A wallet that can pay the 402…

canonical Agent-Initiated Checkout (AP2) match 86%

a2ax402usdcllm

Register agent identity

POST /v1/agents/register is fail-closed: bind an AAWP official or smart-account agentWallet to an integer agent_id using a collected HMAC-valid receipt. Demo re…

canonical Agent-Initiated Checkout (AP2) match 83%

identityerc8004a2a

Agent spend book

GET|POST /v1/agents/:agent_id/book returns last-N collected spend for that agent_id, plus budget Y (cap), spent, and remaining under a prepaid ceiling. Possessi…

canonical PayAction match 83%

identityspend

ERC-8004 validate

POST /erc8004/validate turns a settled receipt into a score (0–100) for a registered agent_id.

canonical Agent Profiles match 82%

erc8004validation

Model catalog

GET /v1/models lists the live catalog. Public, no key.

canonical UCP Catalog Exposure match 83%

catalogopenai-compatible

Health · last 10 probes

When	HTTP	Live JSON-RPC	Latency
2026-08-31 11:18:37	200	—	51ms
2026-08-31 04:38:02	200	—	38ms
2026-08-30 22:36:39	200	—	54ms
2026-08-30 16:31:22	200	—	23ms
2026-08-30 10:16:49	200	—	26ms
2026-08-30 04:01:41	200	—	25ms
2026-08-29 21:55:57	200	—	41ms
2026-08-29 15:50:43	200	—	24ms
2026-08-29 09:39:08	200	—	35ms
2026-08-29 03:20:23	200	—	24ms

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x402 Crypto Micropayment payments

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anchor-x402

Agent Profiles agent_skills

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Embed your Agenstry badge

Paste any of these into your README, agent card, or marketing page. Each badge auto-updates and links back to this page.

Markdown / HTML snippets

[![Agenstry grade](https://agenstry.com/badge/api.xfuel.app.svg)](https://agenstry.com/agents/api.xfuel.app)
[![Verified Business](https://agenstry.com/badge/api.xfuel.app/identity.svg)](https://agenstry.com/agents/api.xfuel.app)
[![Uptime](https://agenstry.com/badge/api.xfuel.app/uptime.svg)](https://agenstry.com/agents/api.xfuel.app)
[![A2A version](https://agenstry.com/badge/api.xfuel.app/protocol.svg)](https://agenstry.com/agents/api.xfuel.app)

Audit-grade evidence bundle

JSON snapshot for vendor-review files. Add ?sign=true for a JWS-signed envelope verifiable against our JWKS. See the methodology.

audit.json audit.json (JWS-signed) verification history

Raw agent card JSON

{
  "_source": "agentic.market",
  "service": {
    "id": "api-xfuel-app",
    "name": "api.xfuel.app",
    "description": "",
    "domain": "api.xfuel.app",
    "provider": "api.xfuel.app",
    "providerUrl": "",
    "category": "",
    "networks": [
      "Base",
      "solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp"
    ],
    "enriched": false,
    "endpoints": [
      {
        "url": "https://api.xfuel.app/task-request",
        "description": "OpenAI-compatible paid inference via x402 USDC on Base and Solana ($0.01). POST /v1/chat/completions is the recommended surface. Returns signed receipt + public verify_url. Paying this host is real mainnet USDC.",
        "pricing": {
          "amount": "0.01",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "chain_id",
            "type": "string",
            "description": "",
            "example": "base",
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "max_tokens",
            "type": "number",
            "description": "",
            "example": 500,
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "message_type",
            "type": "string",
            "description": "",
            "example": "inference_request",
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "messages",
            "type": "array",
            "description": "",
            "example": [],
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "model_id",
            "type": "string",
            "description": "",
            "example": "xfuel/auto",
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "payment",
            "type": "object",
            "description": "",
            "example": null,
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "sender",
            "type": "string",
            "description": "",
            "example": "YourSolanaWalletPubkey",
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "XFuel",
        "tags": [
          "llm",
          "openai-compatible",
          "chat-completions",
          "inference"
        ],
        "quality": {
          "l30DaysTotalCalls": "5",
          "l30DaysUniquePayers": "2"
        }
      },
      {
        "url": "https://api.xfuel.app/v1/chat/completions",
        "description": "Treasury desk and possession book for agent spend. Who paid which call \u2014 export, policy, evidence. POST /v1/chat/completions is the x402 USDC door on Base and Solana. Returns signed receipt + public verify_url. Paying this host is real mainnet USDC.",
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "network": "eip155:8453",
          "scheme": "exact",
          "maxAmount": "",
          "minAmount": ""
        },
        "method": "POST",
        "providerName": "",
        "parameters": [
          {
            "group": "body",
            "name": "max_tokens",
            "type": "number",
            "description": "",
            "example": 500,
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "messages",
            "type": "array",
            "description": "",
            "example": [],
            "enumValues": [],
            "default": null,
            "required": false
          },
          {
            "group": "body",
            "name": "model",
            "type": "string",
            "description": "",
            "example": "xfuel/auto",
            "enumValues": [],
            "default": null,
            "required": false
          }
        ],
        "serviceName": "Chit402",
        "tags": [
          "llm",
          "openai-compatible",
          "chat-completions",
          "inference"
        ],
        "quality": {
          "l30DaysTotalCalls": "80",
          "l30DaysUniquePayers": "9"
        }
      }
    ],
    "integrationType": "",
    "isNew": false,
    "priceSummary": {
      "minAmount": "0.002",
      "maxAmount": "0.01",
      "avgCostPerTransaction": "0.006",
      "avgCostBasis": "exact",
      "currency": "USDC"
    },
    "serviceName": "",
    "tags": [
      "llm",
      "openai-compatible",
      "chat-completions",
      "inference"
    ],
    "iconUrl": ""
  }
}

Activity (audit trail)

Card history

Endpoints

Skills · 6 declared · mapped to canonical taxonomy

Health · last 10 probes

Cheaper or better alternatives per-skill

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Audit-grade evidence bundle

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