Developer Tool · x402

Safe4 payment authorization decision

by api.safe4.ai · discovered, not yet claimed by its owner · updated 2026-08-30

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

Tags: bazaar

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/9046.json for the price and payment options.
Pay. Call GET https://api.safe4.ai/v1/authorize. 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 Sepolia, eip155:5042002, 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: see accepts
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base Sepolia, eip155:5042002, Base
Uptime: 1 of the last 1 checks answered
Calls (30d): 99 · 4 unique payers (third-party data from the public x402 Bazaar)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base Sepolia eip155:84532	USDC	10000	0x1ffc103849B7Ad8866A151149290f6F496e9b439	604900s
exact	eip155:5042002 eip155:5042002	0x3600000000000000000000000000000000000000	10000	0x1ffc103849B7Ad8866A151149290f6F496e9b439	604900s
exact	Base Sepolia eip155:84532	USDC	10000	0x1ffc103849B7Ad8866A151149290f6F496e9b439	600s
exact	Base eip155:8453	USDC	10000	0x1ffc103849B7Ad8866A151149290f6F496e9b439	600s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:84532",
    "payTo": "0x1ffc103849B7Ad8866A151149290f6F496e9b439",
    "asset": "0x036cbd53842c5426634e7929541ec2318f3dcf7e",
    "amount": "10000",
    "maxTimeoutSeconds": 604900
  },
  {
    "scheme": "exact",
    "network": "eip155:5042002",
    "payTo": "0x1ffc103849B7Ad8866A151149290f6F496e9b439",
    "asset": "0x3600000000000000000000000000000000000000",
    "amount": "10000",
    "maxTimeoutSeconds": 604900
  },
  {
    "scheme": "exact",
    "network": "eip155:84532",
    "payTo": "0x1ffc103849B7Ad8866A151149290f6F496e9b439",
    "asset": "0x036cbd53842c5426634e7929541ec2318f3dcf7e",
    "amount": "10000",
    "maxTimeoutSeconds": 600
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x1ffc103849B7Ad8866A151149290f6F496e9b439",
    "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
    "amount": "10000",
    "maxTimeoutSeconds": 600
  }
]

Schemas

Output schema (JSON Schema)

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "agent_id": "agent-research-01",
          "allowed_service_categories": [
            "market-data",
            "research"
          ],
          "amount": "25.00",
          "counterparty": "market-data-provider.example",
          "currency": "USDC",
          "purchase": "Market data API subscription",
          "purchase_purpose": "Pull competitor pricing data for the research",
          "service_category": "market-data",
          "task": "Research competitor pricing for the Q4 strategy deck",
          "task_id": "task-4417"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "audit": {
            "entry_hash": "9f2c1d0a7b5e4c3f8a6d2b1e0c9f8a7d6b5e4c3f2a1d0b9c8e7f6a5d4c3b2a19",
            "previous_hash": "3b1a9c8d7e6f5a4b3c2d1e0f9a8b7c6d5e4f3a2b1c0d9e8f7a6b5c4d3e2f1a09",
            "recorded_at": "2026-08-19T10:32:04.117Z",
            "sequence_number": 1841
          },
          "decision": "ALLOW",
          "evaluator_version": "safe4-task-bound-v1",
          "match_score": 0.75,
          "matched_concepts": [
            "competitor",
            "pricing",
            "research"
          ],
          "payment": {
            "amount": "10000",
            "network": "eip155:8453",
            "payer": "0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed",
            "transaction": "a7f3c9e2-4b1d-4f8a-9c2e-6d5b4a3f2e1c"
          },
          "reason": "The proposed purchase matches the submitted task context.",
          "reason_code": "TASK_PURCHASE_MATCH"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "additionalProperties": false,
              "properties": {
                "agent_id": {
                  "anyOf": [
                    {
                      "maxLength": 200,
                      "type": "string"
                    },
                    {
                      "type": "null"
                    }
                  ],
                  "default": null
                },
                "allowed_counterparties": {
                  "anyOf": [
                    {
                      "items": {
                        "type": "string"
                      },
                      "minItems": 1,
                      "type": "array"
                    },
                    {
                      "type": "null"
                    }
                  ],
                  "default": null
                },
                "allowed_service_categories": {
                  "items": {
                    "type": "string"
                  },
                  "minItems": 1,
                  "type": "array"
                },
                "amount": {
                  "anyOf": [
                    {
                      "exclusiveMinimum": 0,
                      "maximum": 1000000000000,
                      "type": "number"
                    },
                    {
                      "type": "string"
                    }
                  ]
                },
                "counterparty": {
                  "maxLength": 200,
                  "minLength": 1,
                  "type": "string"
                },
                "currency": {
                  "default": "USDC",
                  "maxLength": 10,
                  "minLength": 2,
                  "type": "string"
                },
                "purchase": {
                  "maxLength": 2000,
                  "minLength": 1,
                  "type": "string"
                },
                "purchase_purpose": {
                  "maxLength": 2000,
                  "minLength": 1,
                  "type": "string"
                },
                "service_category": {
                  "maxLength": 80,
                  "minLength": 1,
                  "type": "string"
                },
                "task": {
                  "maxLength": 2000,
                  "minLength": 1,
                  "type": "string"
                },
                "task_id": {
                  "anyOf": [
                    {
                      "maxLength": 200,
                      "type": "string"
                    },
                    {
                      "type": "null"
                    }
                  ],
                  "default": null
                }
              },
              "required": [
                "task",
                "purchase",
                "purchase_purpose",
                "amount",
                "counterparty",
                "service_category",
                "allowed_service_categories"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "headers": {
              "additionalProperties": {
                "type": "string"
              },
              "type": "object"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "queryParams": {
              "additionalProperties": {
                "type": "string"
              },
              "type": "object"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

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

null

Examples

curl

curl "https://api.safe4.ai/v1/authorize"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://api.safe4.ai/v1/authorize");
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://api.safe4.ai/v1/authorize")
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.safe4.ai
Endpoint: https://api.safe4.ai/v1/authorize
Machine-readable: /resources/9046.json