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Api Endpoint

SingIt Anthropic Messages API

Anthropic Messages API for LLM inference (what Claude Code and the Anthropic SDK speak), any model listed at GET /v1/models, Claude included. Call it when an agent needs a Claude-format answer with no API key or account, or wants to try another model the same way. Served by SingIt.

Open interactive test console

Offering

Provider
ask.singitai.app
Method
POST
Offering type
Api Endpoint
Transport type
http
Category
Other
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://ask.singitai.app/v1/messages
MIME type
application/json
First seen
2026-10-19T02:48:42.360Z
Last seen
Tags
LLM, anthropic-messages, claude, Inference, chat, anthropic-compatible, gpt, gemini, deepseek, singit

Website

Payment pricing

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

Payment option 1
0.002852 USDC
Atomic price: 2852 · Network: eip155:8453 · Asset: USDC · Scheme: upto
Payment option 2
0.003852 USDC
Atomic price: 3852 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: upto
Payment option 3
0.001557 USDC
Atomic price: 1557 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 4
0.002557 USDC
Atomic price: 2557 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "upto",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2852",
    "payTo": "0xC23d1Dc0f5fCe1abfFB051e06cB93f0329968B4e"
  },
  {
    "scheme": "upto",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "3852",
    "payTo": "4an2sqamWWhny9mjLsMtGXCDXakeNtg6vSLq4QvhdmQu"
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1557",
    "payTo": "0xC23d1Dc0f5fCe1abfFB051e06cB93f0329968B4e"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "2557",
    "payTo": "4an2sqamWWhny9mjLsMtGXCDXakeNtg6vSLq4QvhdmQu"
  }
]

Observed health

Status
Degraded
Latest latency
2056 ms
Average latency
1124 ms
HTTP status
404
Last checked
Reachability
100% over 12 checks

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

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "POST"
      ]
    },
    "bodyType": {
      "type": "string",
      "enum": [
        "json",
        "form-data",
        "text"
      ]
    },
    "body": {
      "properties": {
        "model": {
          "type": "string",
          "maxLength": 120,
          "examples": [
            "claude-sonnet-5.5",
            "gpt-5.5",
            "gemini-3.8-flash"
          ],
          "description": "Any model id from GET /v1/models; Anthropic's dashed names (claude-sonnet-5-5) work too."
        },
        "max_tokens": {
          "type": "integer",
          "minimum": 1,
          "maximum": 32000,
          "description": "The longest answer, in tokens. The payment ceiling grows with it; the charge follows what was used."
        },
        "messages": {
          "type": "array",
          "minItems": 1,
          "maxItems": 200,
          "description": "The conversation, oldest first (Anthropic format).",
          "items": {
            "type": "object",
            "required": [
              "role",
              "content"
            ],
            "properties": {
              "role": {
                "type": "string",
                "enum": [
                  "user",
                  "assistant"
                ]
              },
              "content": {
                "description": "Text, or a list of Anthropic content blocks."
              }
            }
          }
        },
        "system": {
          "description": "Optional system-level context for the model, as text or content blocks."
        },
        "tools": {
          "type": "array",
          "description": "Optional Anthropic tool definitions."
        },
        "stream": {
          "type": "boolean",
          "enum": [
            false
          ],
          "description": "Streaming is not offered: an answer is paid for whole."
        }
      },
      "required": [
        "model",
        "max_tokens",
        "messages"
      ]
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "required": [
        "billing"
      ],
      "properties": {
        "billing": {
          "type": "object",
          "description": "What was charged, in USDC micro-units",
          "properties": {
            "providerCostAtomic": {
              "type": "string"
            },
            "markupAtomic": {
              "type": "string"
            },
            "totalAtomic": {
              "type": "string",
              "description": "The amount settled"
            },
            "currency": {
              "type": "string",
              "const": "USDC"
            }
          }
        }
      }
    }
  },
  "required": [
    "type"
  ]
}