AI Inference · x402 · early usage

Lint any x402 endpoint or payment header against the v2 spec and real CDP facilitator b…

by agentbit.app · discovered, not yet claimed by its owner · updated 2026-10-08

30d calls5

30d payers3

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Lint any x402 endpoint or payment header against the v2 spec and real CDP facilitator behavior: CAIP-2 network ids, atomic amounts, the EIP-712 domain-name trap ('USD Coin' on Base mainnet vs 'USDC' on Sepolia — wrong name = every settlement fails), the extensions echo Coinbase Bazaar requires for indexing, expired authorizations. Findings as error/warning/info with what will actually break. Built by a seller that debugged all of these in production.

Tags: bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-08

Input example from Bazaar metadata

{
  "url": "https://agentbit.app/v1/web/search"
}

Output example

{
  "accepts_count": 1,
  "counts": {
    "errors": 0,
    "infos": 1,
    "warnings": 0
  },
  "findings": [
    {
      "code": "EIP712_DOMAIN_OK",
      "level": "info",
      "message": "accepts[0]: extra.name matches USDC on Base mainnet."
    }
  ],
  "http_status": 402,
  "mode": "live-probe",
  "url": "https://agentbit.app/v1/web/search",
  "verdict": "pass"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/29082.json for the price and payment options.
Pay. Call GET https://agentbit.app/v1/x402/inspect. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Polygon, Arbitrum One, Solana, eip155:480, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.001 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Polygon, Arbitrum One, Solana, eip155:480
Demand: 5 calls · 3 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.001	0x4395C7e383b7e05665aad7f36ed77c01923Dd965	300s
exact	Polygon eip155:137	USDC	$0.001	0x4395C7e383b7e05665aad7f36ed77c01923Dd965	300s
exact	Arbitrum One eip155:42161	USDC	$0.001	0x4395C7e383b7e05665aad7f36ed77c01923Dd965	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.001	566SN4N4q1dAjSXTf6Ru9FGY7iD1Sj6n3QmGCEigBfYd	300s
exact	eip155:480 eip155:480	0x79A02482A880bCE3F13e09Da970dC34db4CD24d1	1000	0x4395C7e383b7e05665aad7f36ed77c01923Dd965	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x4395C7e383b7e05665aad7f36ed77c01923Dd965",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x4395C7e383b7e05665aad7f36ed77c01923Dd965",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0x4395C7e383b7e05665aad7f36ed77c01923Dd965",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "566SN4N4q1dAjSXTf6Ru9FGY7iD1Sj6n3QmGCEigBfYd",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:480",
    "payTo": "0x4395C7e383b7e05665aad7f36ed77c01923Dd965",
    "asset": "0x79A02482A880bCE3F13e09Da970dC34db4CD24d1",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {},
  "type": "string"
}

Examples

curl

curl "https://agentbit.app/v1/x402/inspect"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://agentbit.app/v1/x402/inspect");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://agentbit.app/v1/x402/inspect")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: agentbit.app
Endpoint: https://agentbit.app/v1/x402/inspect
Machine-readable: /resources/29082.json