Api Endpoint

BlockRun.AI

Anthropic-compatible messages API with streaming support

Open interactive test console

Offering

Provider: BlockRun.AI
Method: POST
Offering type: Api Endpoint
Transport type: http
Category: Creative
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://nano.blockrun.ai/api/v1/messages
MIME type: application/json
First seen: 2026-10-16T01:50:03.832Z
Last seen: 2026-11-04T17:19:50.301Z
Tags: X402, AI, blockchain, ai-&-ml

Website Documentation OpenAPI

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.003 USDC
Atomic price: 3000 · Network: eip155:137 · Asset: USDC · Scheme: exact
Payment option 2: 0.003 USDC
Atomic price: 3000 · Network: eip155:42161 · Asset: USDC · Scheme: exact
Payment option 3: 0.003 USDC
Atomic price: 3000 · Network: eip155:10 · Asset: USDC · Scheme: exact
Payment option 4: 3000 atomic units
Atomic price: 3000 · Network: eip155:130 · Asset: 0x078D782b760474a361dDA0AF3839290b0EF57AD6 · Scheme: exact
Payment option 5: 0.003 USDC
Atomic price: 3000 · Network: eip155:43114 · Asset: USDC · Scheme: exact
Payment option 6: 3000 atomic units
Atomic price: 3000 · Network: eip155:1 · Asset: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 · Scheme: exact
Payment option 7: 3000 atomic units
Atomic price: 3000 · Network: eip155:5042 · Asset: 0x3600000000000000000000000000000000000000 · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:137",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "3000",
    "payTo": "0xe9030014F5DAe217d0A152f02A043567b16c1aBf"
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "3000",
    "payTo": "0xe9030014F5DAe217d0A152f02A043567b16c1aBf"
  },
  {
    "scheme": "exact",
    "network": "eip155:10",
    "asset": "0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85",
    "amount": "3000",
    "payTo": "0xe9030014F5DAe217d0A152f02A043567b16c1aBf"
  },
  {
    "scheme": "exact",
    "network": "eip155:130",
    "asset": "0x078D782b760474a361dDA0AF3839290b0EF57AD6",
    "amount": "3000",
    "payTo": "0xe9030014F5DAe217d0A152f02A043567b16c1aBf"
  },
  {
    "scheme": "exact",
    "network": "eip155:43114",
    "asset": "0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E",
    "amount": "3000",
    "payTo": "0xe9030014F5DAe217d0A152f02A043567b16c1aBf"
  },
  {
    "scheme": "exact",
    "network": "eip155:1",
    "asset": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "amount": "3000",
    "payTo": "0xe9030014F5DAe217d0A152f02A043567b16c1aBf"
  },
  {
    "scheme": "exact",
    "network": "eip155:5042",
    "asset": "0x3600000000000000000000000000000000000000",
    "amount": "3000",
    "payTo": "0xe9030014F5DAe217d0A152f02A043567b16c1aBf"
  }
]

Observed health

Status: Healthy
Latest latency: 64 ms
Average latency: 74 ms
HTTP status: 204
Last checked: 2026-11-04T08:53:31.325Z
Reachability: 100% over 13 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "body": {
    "type": "object",
    "required": [
      "model",
      "messages",
      "max_tokens"
    ],
    "properties": {
      "model": {
        "enum": [
          "anthropic/claude-haiku-4.5",
          "anthropic/claude-sonnet-5.5",
          "anthropic/claude-sonnet-5",
          "anthropic/claude-sonnet-4.6",
          "anthropic/claude-sonnet-4.5",
          "anthropic/claude-opus-4.5",
          "anthropic/claude-opus-4.7",
          "anthropic/claude-fable-5.1",
          "anthropic/claude-fable-5",
          "anthropic/claude-opus-4.8",
          "anthropic/claude-opus-5",
          "anthropic/claude-opus-5.5"
        ],
        "type": "string",
        "description": "Anthropic model id (or any BlockRun-routable Anthropic alias)."
      },
      "tools": {
        "type": "array",
        "items": {
          "type": "object"
        },
        "description": "Anthropic tool definitions."
      },
      "top_k": {
        "type": "integer",
        "minimum": 0
      },
      "top_p": {
        "type": "number",
        "maximum": 1,
        "minimum": 0
      },
      "stream": {
        "type": "boolean",
        "description": "Server-Sent Events stream of Anthropic-style deltas."
      },
      "system": {
        "oneOf": [
          {
            "type": "string"
          },
          {
            "type": "array",
            "items": {
              "type": "object"
            }
          }
        ],
        "description": "System prompt — string, or array of { type: 'text', text }."
      },
      "messages": {
        "type": "array",
        "items": {
          "type": "object",
          "required": [
            "role",
            "content"
          ],
          "properties": {
            "role": {
              "enum": [
                "user",
                "assistant"
              ],
              "type": "string"
            },
            "content": {
              "oneOf": [
                {
                  "type": "string"
                },
                {
                  "type": "array",
                  "items": {
                    "type": "object"
                  }
                }
              ],
              "description": "String, or array of Anthropic content blocks (text/image/tool_use/tool_result)."
            }
          }
        }
      },
      "metadata": {
        "type": "object",
        "properties": {
          "user_id": {
            "type": "string"
          }
        }
      },
      "max_tokens": {
        "type": "integer",
        "minimum": 1,
        "description": "Maximum tokens to generate."
      },
      "temperature": {
        "type": "number",
        "maximum": 1,
        "minimum": 0
      },
      "tool_choice": {
        "type": "object",
        "description": "Anthropic tool_choice spec."
      },
      "stop_sequences": {
        "type": "array",
        "items": {
          "type": "string"
        }
      }
    }
  },
  "type": "http",
  "method": "POST",
  "bodyType": "json"
}

Output schema

{
  "type": "object",
  "properties": {
    "example": {
      "type": "object",
      "properties": {
        "usage": {
          "type": "object"
        },
        "choices": {
          "type": "array"
        }
      }
    }
  }
}