ToolFit by YourAITools

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "X-PAYMENT header is required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://api.youraitools.co/toolfit/v1/full",
      "description": "Full audit of an agent tool list (tools array or public remote MCP URL): every schema issue per provider (OpenAI, Anthropic, Gemini, Bedrock, MCP; strict mode opt-in) with JSON path and source link, rewritten definitions per provider, confusable tool pairs with distinguishing terms and fix hints, description and poisoning lints, per-tool fingerprints and a pin.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "url": {
              "type": "string",
              "required": false,
              "description": "Public remote MCP server URL (Streamable HTTP, https), e.g. https://api.youraitools.co/mcp/hub. ToolFit only lists its tools."
            },
            "tools": {
              "type": "string",
              "required": false,
              "description": "Tool definitions: MCP tools/list entries, OpenAI {type:\"function\",function:{...}}, Anthropic {name,description,input_schema}, Gemini functionDeclarations or Bedrock toolSpec. Max 500."
            },
            "providers": {
              "type": "string",
              "required": false,
              "description": "Providers to check (default openai, anthropic, gemini, bedrock, mcp; add openai_strict for Structured Outputs strict mode). GET: comma list."
            }
          },
          "discoverable": true
        },
        "output": {
          "pin": {
            "set_id": "ts_0123456789abcdef0123456789abcdef"
          },
          "fixed": {
            "openai": {
              "changed": 8
            }
          },
          "grade": "D",
          "score": 62,
          "tools": 31,
          "issues": [
            {
              "path": "description",
              "rule": "description_length",
              "tool": "read_url",
              "provider": "openai",
              "severity": "error"
            }
          ],
          "tokens": {
            "avg": 374,
            "total": 11585
          },
          "poisoning": {
            "high": 0,
            "findings": 0
          },
          "providers": {
            "gemini": {
              "errors": 9,
              "compatible": false
            },
            "openai": {
              "errors": 8,
              "compatible": false
            },
            "anthropic": {
              "errors": 0,
              "compatible": true
            }
          },
          "confusable": {
            "high": 1,
            "count": 5
          }
        }
      },
      "maxAmountRequired": "10000",
      "maxTimeoutSeconds": 120
    }
  ],
  "message": "Payment required: ToolFit GET /toolfit/v1/full costs $0.01 per call in USDC. Will my agent's tools work on every model? Pay per call in USDC with any x402 client: read the PAYMENT-REQUIRED header (x402 v2) or the accepts list in this body (x402 v1), sign the payment and retry the same request with the PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header. Networks: Base, Polygon, Arbitrum. No account, no API key. No crypto wallet? Buy prepaid credits by card or USDC at https://api.youraitools.co/credits/ and send them as a Bearer key. Free: 20 audits/day and 10 MCP server checks/day (remote MCP: audit_tools, diff_tools, check_mcp_server), then $0.002 to $0.01 per call in USDC",
  "x402Version": 1,
  "payment_help": {
    "docs": "https://api.youraitools.co/toolfit/",
    "tool": "ToolFit",
    "what": "Will my agent's tools work on every model? Lints an MCP server or tool list for OpenAI, Anthropic and Gemini schema errors, confusable tool pairs, tool poisoning and token cost, with a grade, fixes and a pinned set to diff later (MCPCheck: live preflight of a remote MCP server). Lists tools only, never calls them.",
    "price": "$0.01 per call (USDC)",
    "route": "GET https://api.youraitools.co/toolfit/v1/full",
    "mcp_hub": "https://api.youraitools.co/mcp/hub",
    "free_tier": "20 audits/day and 10 MCP server checks/day (remote MCP: audit_tools, diff_tools, check_mcp_server), then $0.002 to $0.01 per call in USDC",
    "pay_with_x402": "Pay per call in USDC with any x402 client: read the PAYMENT-REQUIRED header (x402 v2) or the accepts list in this body (x402 v1), sign the payment and retry the same request with the PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header. Networks: Base, Polygon, Arbitrum. No account, no API key.",
    "pay_with_credits": {
      "url": "https://api.youraitools.co/credits/",
      "use": "Send the key as Authorization: Bearer yatc_... on the same request; each call is deducted at the listed price.",
      "card": "Pay by card (Stripe): $5, $20 or $50 credit packs, no crypto wallet needed.",
      "wallet": "Or buy $1 or $5 of credits in USDC with the one-click browser wallet button on the same page.",
      "card_checkout": "https://api.youraitools.co/credits/ (choose a pack under Pay by card; Stripe checkout opens in one click)"
    }
  }
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "url": "https://api.youraitools.co/mcp/hub"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "pin": {
            "set_id": "ts_0123456789abcdef0123456789abcdef"
          },
          "fixed": {
            "openai": {
              "changed": 8
            }
          },
          "grade": "D",
          "score": 62,
          "tools": 31,
          "issues": [
            {
              "path": "description",
              "rule": "description_length",
              "tool": "read_url",
              "provider": "openai",
              "severity": "error"
            }
          ],
          "tokens": {
            "avg": 374,
            "total": 11585
          },
          "poisoning": {
            "high": 0,
            "findings": 0
          },
          "providers": {
            "gemini": {
              "errors": 9,
              "compatible": false
            },
            "openai": {
              "errors": 8,
              "compatible": false
            },
            "anthropic": {
              "errors": 0,
              "compatible": true
            }
          },
          "confusable": {
            "high": 1,
            "count": 5
          }
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "required": [],
              "properties": {
                "url": {
                  "type": "string",
                  "description": "Public remote MCP server URL (Streamable HTTP, https), e.g. https://api.youraitools.co/mcp/hub. ToolFit only lists its tools."
                },
                "tools": {
                  "type": "array",
                  "items": {
                    "type": "object"
                  },
                  "description": "Tool definitions: MCP tools/list entries, OpenAI {type:\"function\",function:{...}}, Anthropic {name,description,input_schema}, Gemini functionDeclarations or Bedrock toolSpec. Max 500."
                },
                "providers": {
                  "type": "array",
                  "items": {
                    "enum": [
                      "openai",
                      "openai_strict",
                      "anthropic",
                      "gemini",
                      "bedrock",
                      "mcp"
                    ],
                    "type": "string"
                  },
                  "description": "Providers to check (default openai, anthropic, gemini, bedrock, mcp; add openai_strict for Structured Outputs strict mode). GET: comma list."
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog

2026-10-24 22:12Z

Last indexed by Roundhouse

2026-10-26 20:46Z

Last enriched (probe, favicon, geo)

2026-10-25 11:17Z

x402 version

2

Max timeout

120s

Liveness probe

HTTP 402