# Agoranome Seller Attest

> Agoranome Seller Attest is a paid API for AI agents from api.agoranome.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-28).

Generates a cryptographically signed attestation for a paid x402 API endpoint by fetching a sample output and signing its hash, so buyer agents can verify what they're purchasing before paying.

## Facts

- Endpoint: GET https://api.agoranome.com/v1/seller/attest?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agoranome-seller-attest-1f3389d4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q5tVs1FJPxsFmGPMiiP5D

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability agoranome-seller-attest-1f3389d4
```

Example prompt: Attest my x402 API endpoint at https://api.myservice.com/v1/data — use https://api.myservice.com/v1/data/sample as the public sample URL — so buyers can trust what they're getting before paying.

## When to prefer this

Use this endpoint when you are an API seller who wants to add cryptographic trust signals to a paid x402 endpoint so that buyer agents can verify the offer's sample output before committing payment. It is specifically designed for x402 marketplace credibility — prefer it over generic signing tools when your goal is to produce an Agoranome-recognized attestation that integrates with Bazaar rankings and buyer agent evaluation flows.

## Known failure modes

- Sample URL is not publicly reachable or returns a non-200 status — attestation cannot be generated
- Sample URL and resource URL are on different hosts — schema requires same-host pairing
- Resource URL is not a valid x402 paid endpoint — attestation may be rejected
- Network timeout fetching the sample — request fails with an error
- Invalid HTTP method supplied — schema only accepts GET, HEAD, or DELETE

## How this service works

Trust proof for an x402 seller: a signed attestation of your API's sample output, so buyer agents can check it before paying. Agoranome fetches a free sample from your endpoint's host, checks that your paid route on the same host answers with an x402 offer, and signs an attestation of what it saw and when: the sample's SHA-256 and body, and the offer's price, network and pay-to. Buyers check it at a public URL.

## Output

Returns a JSON object containing an attestation ID, a URL to the full attestation record, and a nested attestation object that includes the offer's payment details (wallet address and price in USD), the sample's byte size and SHA256 hash and HTTP status, and a provenance object with a cryptographic signature and the attesting agent's wallet address.

## Request schema (JSON Schema)

```json
{
 "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": [
      "sample",
      "resource"
     ],
     "properties": {
      "sample": {
       "type": "string",
       "description": "Public https URL that returns a sample output without payment"
      },
      "resource": {
       "type": "string",
       "description": "Your paid x402 endpoint, on the same host as the sample"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "url": "https://api.agoranome.com/v1/attestations/att_...",
   "attestation": {
    "offer": {
     "accepts": [
      {
       "pay_to": "0x...",
       "price_usd": 0.02
      }
     ]
    },
    "sample": {
     "bytes": 1832,
     "sha256": "...",
     "status": 200
    },
    "provenance": {
     "signature": "...",
     "agent_address": "0x..."
    }
   },
   "attestation_id": "att_..."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agoranome-seller-attest-1f3389d4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.agoranome.com](https://www.zero.xyz/host/api.agoranome.com/llms.txt)