X402 Delivery Content Type Check: compares delivery content type with buyer-accepted me…

What it does

X402 Delivery Content Type Check: compares delivery content type with buyer-accepted media types using only bounded caller-supplied values. Call when you need a bounded x402 delivery content type check result before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for X402 Delivery Content Type Check as versioned d…

Tags: x402 · delivery · contract · bazaar · payment-identifier

Call contract

Method

POST

Input

json

Output

json

Last paid call

2026-10-08

{
  "accepted": [
    "application/json"
  ],
  "content_type": "application/json; charset=utf-8"
}

{
  "evidence": {
    "external_calls": 0,
    "input_sha256": "17d22f796e7932f46bbb49530f843fcbb42e7bea6267a2306a495865b24fc926",
    "retained": false
  },
  "operation": "delivery_contract:x402_delivery_content_type_check",
  "result": {
    "accepted": true,
    "content_type": "application/json"
  },
  "schema": "delx/util-x402-delivery-content-type-check/v1",
  "status": "pass"
}

Use with an agent

1. Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
2. Inspect. Fetch /resources/31146.json for the price and payment options.
3. Pay. Call GET https://api.delx.ai/api/v1/x402/x402-delivery-content-type-check. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
4. 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, Solana, 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, Solana

Demand

3 calls · 2 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x9f8bd9875b3E0b632a24A3A7C73f7787175e73A2",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x9f8bd9875b3E0b632a24A3A7C73f7787175e73A2",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "28heAMpFkeUJsL7o7apiK4oJwZWq2fUHinRwbgYYsemG",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  }
]

Schemas

{
  "additionalProperties": true,
  "description": "Versioned bounded first-party JSON result with input evidence; caller data is processed in memory and not retained.",
  "properties": {
    "evidence": {
      "additionalProperties": true,
      "properties": {
        "external_calls": {
          "type": "integer"
        },
        "input_sha256": {
          "type": "string"
        },
        "retained": {
          "type": "boolean"
        }
      },
      "type": "object"
    },
    "operation": {
      "type": "string"
    },
    "result": {
      "additionalProperties": true,
      "properties": {
        "accepted": {
          "type": "boolean"
        },
        "content_type": {
          "type": "string"
        }
      },
      "type": "object"
    },
    "schema": {
      "type": "string"
    },
    "status": {
      "type": "string"
    }
  },
  "type": "object"
}

{
  "evidence": {
    "external_calls": 0,
    "input_sha256": "string",
    "retained": true
  },
  "operation": "string",
  "result": {
    "accepted": true,
    "content_type": "string"
  },
  "schema": "string",
  "status": "string"
}

Examples

curl -X POST 'https://api.delx.ai/api/v1/x402/x402-delivery-content-type-check' -H 'Content-Type: application/json' --data '{"accepted":["application/json"],"content_type":"application/json; charset=utf-8"}'
# -> 402 Payment Required; read PAYMENT-REQUIRED
# retry the identical request with PAYMENT-SIGNATURE

const res = await fetch("https://api.delx.ai/api/v1/x402/x402-delivery-content-type-check", {
  "method": "POST",
  "headers": {
    "content-type": "application/json"
  },
  "body": "{\"accepted\":[\"application/json\"],\"content_type\":\"application/json; charset=utf-8\"}"
});
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
import json
res = httpx.request("POST", "https://api.delx.ai/api/v1/x402/x402-delivery-content-type-check", json=json.loads("{\"accepted\":[\"application/json\"],\"content_type\":\"application/json; charset=utf-8\"}"))
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

api.delx.ai

Endpoint

https://api.delx.ai/api/v1/x402/x402-delivery-content-type-check

Machine-readable

/resources/31146.json