Anthropic-compatible Messages API — pay per token with USDC on Base
Anthropic-compatible Messages API — pay per token with USDC on Base
Answeringour last check, 2026-09-24
1 of 1checks answered this week
207 msmedian answer time
$0.011listed price per call
$0.011price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://blockrun.ai/api/v1/messages
| Category | Market data |
|---|---|
| Provider host | blockrun.ai |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 5,449 from 5 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.011 | 207 ms |
Example input (from the provider)
{
"bodyFields": {
"max_tokens": {
"description": "Max output tokens",
"type": "integer"
},
"messages": {
"description": "Conversation history",
"type": "array"
},
"model": {
"description": "Anthropic-style model id",
"type": "string"
},
"stream": {
"description": "Stream response as SSE",
"type": "boolean"
},
"system": {
"description": "Optional system prompt",
"type": "string"
},
"tools": {
"description": "Optional tool definitions",
"type": "array"
}
},
"discoverable": true,
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"properties": {
"input": {
"properties": {
"body": {
"properties": {
"max_tokens": {
"description": "Max output tokens the model may generate",
"type": "integer"
},
"messages": {
"description": "Conversation history, Anthropic Messages API shape",
"type": "array"
},
"model": {
"description": "Anthropic-style model id (e.g. anthropic/claude-opus-5, anthropic/claude-sonnet-4.6)",
"type": "string"
},
"stream": {
"description": "Stream the response as SSE",
"type": "boolean"
},
"system": {
"description": "Optional system prompt",
"type": "string"
},
"temperature": {
"description": "Sampling temperature 0\u20131",
"type": "number"
},
"tools": {
"description": "Optional tool definitions for tool use",
"type": "array"
}
},
"required": [
"model",
"max_tokens",
"messages"
],
"type": "object"
}
},
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"content": {
"type": "array"
},
"id": {
"type": "string"
},
"model": {
"type": "string"
},
"role": {
"type": "string"
},
"type": {
"type": "string"
},
"usage": {
"type": "object"
}
},
"type": "object"
}
},
"type": "object"
}
},
"type": "object"
}