Payments · x402 · early usage

Use this after fair_commit, once every player has seen the server_seed_hash: give your…

Use this after fair_commit, once every player has seen the server_seed_hash: give your client_seed and get uniform random integers in [min, max]. Price: $0.003 in USDC on Base or Solana, or $0.02 in USDG or $SWOGE on Robinhood Chain (tool price + settlement c…

by web-production-220a3.up.railway.app · discovered, not yet claimed by its owner · updated 2026-09-28

30d calls1

30d payers1

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

Tags: randomness · bazaar · eip2612GasSponsoring

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-09-28

Input example from Bazaar metadata

{
  "arguments": {
    "client_seed": "agent-42",
    "commitment_id": "6a1f0c3e9b7d2a5c8e4f1b0d",
    "count": 5,
    "max": 6,
    "min": 1
  }
}

Output example

{
  "ok": true,
  "outil": "fair_draw",
  "resultat": {
    "algorithm": "swoge-hmac-sha256-v1",
    "already_drawn": false,
    "client_seed": "agent-42",
    "commitment_id": "6a1f0c3e9b7d2a5c8e4f1b0d",
    "committed_at": "2026-09-28T21:00:00.000Z",
    "count": 5,
    "drawn_at": "2026-09-28T21:02:00.000Z",
    "max": 6,
    "min": 1,
    "numbers": [
      3,
      4,
      3,
      5,
      3
    ],
    "server_seed": "3f9a1c7e5b2d4086a1f3e5c7b9d0f2a4c6e8b1d3f5a7c9e0b2d4f6a8c0e2b4d6",
    "server_seed_hash": "b85ef21a5deba1bcd033f7eb675b391cf40ce04d63d5e3da39ed9f61f27180b8",
    "verify_code": "const c=require(\"crypto\");function draw(s,cs,n,min,max){...}"
  },
  "texte": "Draw: 3, 4, 3, 5, 3 in [1, 6]. server_seed 3f9a1c7e... (hash b85ef21a...), client_seed \"agent-42\"."
}

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/38625.json for the price and payment options.
Pay. Call GET https://web-production-220a3.up.railway.app/agentic/call/fair_draw. 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, Solana, eip155:4663, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.003 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Solana, eip155:4663
Demand: 1 calls · 1 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.003	0xE81C67c086c83997b41673e1e41e481c14D756F6	120s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.003	CFg86EW2ZSAgGpf4o2XAt3gU59fgMfsuZyM6QDuDTmoM	120s
exact	eip155:4663 eip155:4663	0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168	20000	0xE81C67c086c83997b41673e1e41e481c14D756F6	120s
exact	eip155:4663 eip155:4663	0x8a166Fb41Cd659a0a43396272FF73973Ce29F817	764955323713042389500	0xE81C67c086c83997b41673e1e41e481c14D756F6	120s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xE81C67c086c83997b41673e1e41e481c14D756F6",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3000",
    "amountUsd": 0.003,
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "CFg86EW2ZSAgGpf4o2XAt3gU59fgMfsuZyM6QDuDTmoM",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "3000",
    "amountUsd": 0.003,
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "eip155:4663",
    "payTo": "0xE81C67c086c83997b41673e1e41e481c14D756F6",
    "asset": "0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168",
    "amount": "20000",
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "eip155:4663",
    "payTo": "0xE81C67c086c83997b41673e1e41e481c14D756F6",
    "asset": "0x8a166Fb41Cd659a0a43396272FF73973Ce29F817",
    "amount": "764955323713042389500",
    "maxTimeoutSeconds": 120
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "ok": {
          "const": true,
          "type": "boolean"
        },
        "outil": {
          "const": "fair_draw",
          "type": "string"
        },
        "resultat": {
          "properties": {
            "algorithm": {
              "type": "string"
            },
            "already_drawn": {
              "type": "boolean"
            },
            "client_seed": {
              "type": "string"
            },
            "commitment_id": {
              "type": "string"
            },
            "committed_at": {
              "type": "string"
            },
            "count": {
              "type": "number"
            },
            "drawn_at": {
              "type": "string"
            },
            "max": {
              "type": "number"
            },
            "min": {
              "type": "number"
            },
            "note": {
              "type": [
                "string",
                "null"
              ]
            },
            "numbers": {
              "items": {
                "type": "number"
              },
              "type": "array"
            },
            "server_seed": {
              "type": "string"
            },
            "server_seed_hash": {
              "type": "string"
            },
            "verify_code": {
              "type": "string"
            }
          },
          "required": [
            "commitment_id",
            "algorithm",
            "server_seed_hash",
            "server_seed",
            "client_seed",
            "count",
            "min",
            "max",
            "numbers",
            "drawn_at",
            "verify_code",
            "already_drawn"
          ],
          "type": "object"
        },
        "texte": {
          "type": "string"
        },
        "x402": {
          "properties": {
            "amount": {
              "type": "string"
            },
            "asset": {
              "type": "string"
            },
            "network": {
              "type": "string"
            },
            "transaction": {
              "type": "string"
            }
          },
          "required": [
            "transaction",
            "network",
            "amount",
            "asset"
          ],
          "type": "object"
        }
      },
      "required": [
        "ok",
        "outil"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

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

{
  "example": {
    "ok": true,
    "outil": "string",
    "resultat": {
      "algorithm": "string",
      "already_drawn": true,
      "client_seed": "string",
      "commitment_id": "string",
      "committed_at": "string",
      "count": 0,
      "drawn_at": "string",
      "max": 0,
      "min": 0,
      "note": "string",
      "numbers": [
        0
      ],
      "server_seed": "string",
      "server_seed_hash": "string",
      "verify_code": "string"
    },
    "texte": "string",
    "x402": {
      "amount": "string",
      "asset": "string",
      "network": "string",
      "transaction": "string"
    }
  },
  "type": "string"
}

Examples

curl

curl "https://web-production-220a3.up.railway.app/agentic/call/fair_draw"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://web-production-220a3.up.railway.app/agentic/call/fair_draw");
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://web-production-220a3.up.railway.app/agentic/call/fair_draw")
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: web-production-220a3.up.railway.app
Endpoint: https://web-production-220a3.up.railway.app/agentic/call/fair_draw
Machine-readable: /resources/38625.json