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Api Endpoint

SingIt Claude Opus 5.5 Chat

Claude Opus 5.5 (Anthropic) LLM chat completions, OpenAI-compatible, with no API key or account. Anthropic's largest Claude model: long-context reasoning, multi-step coding and agentic tasks. Call it when an agent needs Claude Opus 5.5 specifically. 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/chat/claude-opus-5.5
MIME type
application/json
First seen
2026-10-26T21:37:17.077Z
Last seen
Tags
LLM, chat-completions, claude-opus-5.5, anthropic, openai-compatible, claude, Inference, chat, singit

Website

Payment pricing

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

Payment option 1
0.005524 USDC
Atomic price: 5524 · Network: eip155:8453 · Asset: USDC · Scheme: upto
Payment option 2
0.006524 USDC
Atomic price: 6524 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: upto
Payment option 3
0.002515 USDC
Atomic price: 2515 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 4
0.003515 USDC
Atomic price: 3515 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "upto",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5524",
    "payTo": "0xC23d1Dc0f5fCe1abfFB051e06cB93f0329968B4e"
  },
  {
    "scheme": "upto",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "6524",
    "payTo": "4an2sqamWWhny9mjLsMtGXCDXakeNtg6vSLq4QvhdmQu"
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2515",
    "payTo": "0xC23d1Dc0f5fCe1abfFB051e06cB93f0329968B4e"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "3515",
    "payTo": "4an2sqamWWhny9mjLsMtGXCDXakeNtg6vSLq4QvhdmQu"
  }
]

Observed health

Status
Degraded
Latest latency
337 ms
Average latency
2588 ms
HTTP status
404
Last checked
Reachability
75% over 4 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": {
        "messages": {
          "type": "array",
          "minItems": 1,
          "maxItems": 40,
          "description": "The conversation, oldest first.",
          "items": {
            "type": "object",
            "required": [
              "role",
              "content"
            ],
            "properties": {
              "role": {
                "type": "string",
                "enum": [
                  "system",
                  "user",
                  "assistant"
                ]
              },
              "content": {
                "type": "string",
                "description": "Plain text; all messages together under 24000 characters."
              }
            }
          }
        },
        "max_tokens": {
          "type": "integer",
          "minimum": 1,
          "maximum": 1200,
          "default": 800,
          "description": "The longest answer, in tokens. The payment ceiling grows with it; the charge follows what was used."
        },
        "model": {
          "type": "string",
          "examples": [
            "deepseek-v4.1-flash",
            "claude-opus-5.5",
            "gpt-5.5",
            "gemini-3.1-pro"
          ],
          "description": "Any model id from GET /v1/models; the ceiling follows its price. Omit for the default model."
        },
        "fallback_models": {
          "type": "array",
          "minItems": 1,
          "maxItems": 3,
          "uniqueItems": true,
          "items": {
            "type": "string"
          },
          "description": "Optional on paid /v1/chat/completions only: 1–3 trimmed unique model ids, excluding the pinned model and singit/auto. Before payment, an unavailable pinned model may use the first healthy priced candidate whose Base upto ceiling is no higher than the pinned ceiling, and in the same auto tier if the pinned model has one. The chosen model determines the quote and usage charge."
        },
        "stream": {
          "type": "boolean",
          "enum": [
            false
          ],
          "description": "Streaming is not offered."
        }
      },
      "required": [
        "messages"
      ]
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "required": [
        "choices",
        "billing"
      ],
      "properties": {
        "id": {
          "type": "string"
        },
        "object": {
          "type": "string",
          "const": "chat.completion"
        },
        "created": {
          "type": "integer",
          "description": "Unix seconds"
        },
        "model": {
          "type": "string"
        },
        "choices": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "index": {
                "type": "integer"
              },
              "message": {
                "type": "object",
                "properties": {
                  "role": {
                    "type": "string"
                  },
                  "content": {
                    "type": "string"
                  }
                }
              },
              "finish_reason": {
                "type": "string",
                "description": "stop, or length when max_tokens ended the answer"
              }
            }
          }
        },
        "usage": {
          "type": "object",
          "description": "Token counts and the model's own cost in micro-USD (buyer_cost_micro)"
        },
        "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"
  ]
}