Security · x402 · early usage

Check an ACP offering's published contract before you buy

by app.tenna.ai · discovered, not yet claimed by its owner · updated 2026-10-06

30d calls4

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

Check an ACP offering's published contract before you buy. Detects listings that declare no JSON deliverable schema, name required fields they never declare, or specify no input schema at all — the defects that make a purchase unverifiable after the fact. Reads the public listing only; nothing is purchased or executed. Deterministic, no model judgment. A PASS means the listing is machine-checkable — it is not a correctness guarantee and says nothing about output quality.

Tags: agent · offering · schema · lint · x402 · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-06

Input example from Bazaar metadata

{
  "offering": "acp_offering_contract_lint",
  "offeringContract": {}
}

Output example

{
  "buyerReadable": true,
  "dataState": "<dataState>",
  "findings": [
    {}
  ],
  "grade": "<grade>",
  "limitations": [
    "<limitations>"
  ],
  "offering": "acp_offering_contract_lint",
  "provenance": {
    "auditedDeliverableHash": null,
    "generatedAt": 1,
    "ledgerLaunchCount": null,
    "ledgerSpanHours": null,
    "resultHash": null,
    "rubricVersion": null,
    "source": "<source>"
  },
  "schemaVersion": "<schemaVersion>",
  "severityCounts": {}
}

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/26982.json for the price and payment options.
Pay. Call GET https://app.tenna.ai/api/x402/verifier/acp_offering_contract_lint. 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, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.01 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 4 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	$0.01	0x7eaf3c393a8996e124c0fa7ccbc55019854c4c5b	60s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x7eaf3c393a8996e124c0fa7ccbc55019854c4c5b",
    "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 60
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "additionalProperties": true,
      "properties": {
        "buyerReadable": {
          "description": "Whether a buyer can verify conformance mechanically.",
          "type": "boolean"
        },
        "dataState": {
          "description": "COMPLETE.",
          "type": "string"
        },
        "findings": {
          "description": "Contract defects, each with an evidencePath.",
          "items": {
            "type": "object"
          },
          "type": "array"
        },
        "grade": {
          "description": "PASS, WARN or FAIL.",
          "type": "string"
        },
        "limitations": {
          "description": "Coverage limits and missing data, always disclosed.",
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "offering": {
          "const": "acp_offering_contract_lint",
          "description": "Offering that produced this result.",
          "type": "string"
        },
        "provenance": {
          "description": "Reproducibility metadata so another agent can audit this.",
          "properties": {
            "auditedDeliverableHash": {
              "description": "Explicit alias for resultHash on deliverable-audit results; hashes the buyer-supplied input, not the audit envelope.",
              "type": [
                "string",
                "null"
              ]
            },
            "generatedAt": {
              "description": "Unix seconds.",
              "type": "integer"
            },
            "ledgerLaunchCount": {
              "description": "Launches in the ledger. Null when the offering is not derived from the launch ledger — this means not applicable, not collection failure.",
              "type": [
                "integer",
                "null"
              ]
            },
            "ledgerSpanHours": {
              "description": "Hours of history covered. Null when the offering is not derived from the launch ledger.",
              "type": [
                "number",
                "null"
              ]
            },
            "resultHash": {
              "description": "Hash of the audited input, so the same verdict can be reproduced. Present on audit offerings.",
              "type": [
                "string",
                "null"
              ]
            },
            "rubricVersion": {
              "description": "Rubric the verdict was produced under. Present on audit offerings.",
              "type": [
                "string",
                "null"
              ]
            },
            "source": {
              "description": "Data origin.",
              "type": "string"
            }
          },
          "type": "object"
        },
        "schemaVersion": {
          "description": "Deliverable contract version.",
          "type": "string"
        },
        "severityCounts": {
          "description": "Finding counts by severity.",
          "type": "object"
        }
      },
      "required": [
        "schemaVersion",
        "offering",
        "provenance",
        "limitations",
        "dataState",
        "grade",
        "severityCounts",
        "findings",
        "buyerReadable"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

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

{
  "example": {
    "buyerReadable": true,
    "dataState": "string",
    "findings": [
      {}
    ],
    "grade": "string",
    "limitations": [
      "string"
    ],
    "offering": "string",
    "provenance": {
      "auditedDeliverableHash": "string",
      "generatedAt": 0,
      "ledgerLaunchCount": 0,
      "ledgerSpanHours": 0,
      "resultHash": "string",
      "rubricVersion": "string",
      "source": "string"
    },
    "schemaVersion": "string",
    "severityCounts": {}
  },
  "type": "string"
}

Examples

curl

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

JavaScript

const res = await fetch("https://app.tenna.ai/api/x402/verifier/acp_offering_contract_lint");
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://app.tenna.ai/api/x402/verifier/acp_offering_contract_lint")
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: app.tenna.ai
Endpoint: https://app.tenna.ai/api/x402/verifier/acp_offering_contract_lint
Machine-readable: /resources/26982.json