{
  "id": "multipart-form-encode",
  "name": "Exact multipart form body encoder",
  "description": "WHEN TO USE: Construct exact inert multipart/form-data bytes from ordered supplied text or binary file parts, preserving repeated field names. Caller supplies a collision-checked boundary; explicit utf8 or canonical padded Base64 output and decoded wire byte count. Strict ASCII names prevent header injection; no upload, custom headers, nested multipart, automatic field flattening or API acceptance claim.",
  "category": "structured",
  "priceUsd": "0.005",
  "pricingStatus": "proposed-unverified",
  "pricing": {
    "unit": "one successful operation call",
    "proposedNominalUsd": "0.005",
    "sixDecimalTokenBaseUnits": "5000",
    "subscription": false,
    "includesPayerWalletOrNetworkFees": false,
    "liveQuoteVerified": false,
    "condition": "Actual SDK challenge is authoritative only within the caller's explicit authorization; configured six-decimal token peg is an operator assertion, not a conversion guarantee."
  },
  "intents": [
    "Encode ordered multipart form-data upload bodies with binary files and repeated field names",
    "Measure exact multipart request bytes with deterministic collision-checked boundaries"
  ],
  "whenToUse": [
    "Encode ordered multipart form-data upload bodies with binary files and repeated field names",
    "Measure exact multipart request bytes with deterministic collision-checked boundaries"
  ],
  "whenNotToUse": [
    "Performing HTTP requests or uploads, headers beyond Content-Disposition and Content-Type, nested multipart or endpoint compatibility",
    "Non-ASCII field names or filenames, path filenames, filename*, or implicit charset guessing",
    "Uploading, executing artifacts, contacting agents or registries, publishing, or changing remote state",
    "Verifying semantic truth, source authenticity, permissions, target API acceptance or signatures"
  ],
  "capabilities": [
    "Profile rfc7578-bounded-body-v1; exact CRLF framing and one final closing delimiter",
    "Boundary token rejected anywhere in decoded payload; linear byte scanning",
    "Filename-free fields require text/plain, valid UTF-8 and charset=UTF-8; file media types retain caller casing",
    "Canonical padded standard Base64 with zero padding bits; utf8 output requires valid full-body UTF-8",
    "Deterministic supplied-input-only artifact; zero external requests and no current-time dependence"
  ],
  "limits": {
    "inputBytes": 100000,
    "outputBytes": 400000,
    "jsonNodes": 12000,
    "depth": 20,
    "profile": "rfc7578-bounded-body-v1",
    "parts": 32,
    "nameBytes": 64,
    "filenameBytes": 128,
    "mediaTypeBytes": 127,
    "boundaryBytes": 60,
    "payloadBytes": 60000,
    "wireBytes": 100000,
    "mediaTypeProfile": "RFC6838 restricted ASCII type/subtype; no parameters"
  },
  "related": [
    "json-batch-encode",
    "base64-convert",
    "content-digest"
  ],
  "errorCodes": [
    "INPUT_LIMIT",
    "OUTPUT_LIMIT",
    "COMPLEXITY_LIMIT",
    "INVALID_JSON",
    "INVALID_NUMBER",
    "INVALID_UNICODE",
    "UNSAFE_KEY",
    "INVALID_BASE64",
    "PAYLOAD_LIMIT",
    "NESTED_MULTIPART",
    "TEXT_MEDIA_TYPE",
    "INVALID_UTF8",
    "BOUNDARY_COLLISION",
    "WIRE_LIMIT"
  ],
  "requirementsProfile": {
    "format": "declared-requirements-v1",
    "facts": {
      "execution.suppliedCode": false,
      "execution.remoteMutation": false,
      "execution.llmInference": false,
      "execution.paidMcp": false,
      "verification.semanticTruth": false,
      "verification.sourceAuthenticity": false,
      "verification.liveVulnerabilities": false,
      "numbers.arbitraryPrecisionJson": false,
      "numbers.model": "ieee754-binary64",
      "privacy.requestBodyPersisted": false,
      "execution.deterministic": true,
      "execution.networkAccess": false,
      "privacy.resultBodyPersisted": false,
      "payment.x402": true,
      "payment.mpp": true,
      "operation.id": "multipart-form-encode",
      "operation.category": "structured",
      "limit.httpRequestBytes": 131072,
      "limit.requestBytes": 100000,
      "limit.responseBytes": 524288,
      "limit.resultBytes": 400000,
      "limit.jsonDepth": 20,
      "limit.jsonNodes": 12000,
      "multipart.profile": "rfc7578-bounded-body-v1",
      "multipart.maxParts": 32,
      "multipart.maxBoundaryAsciiBytes": 60,
      "multipart.maxDecodedPayloadBytes": 60000,
      "multipart.maxWireBytes": 100000,
      "multipart.repeatedNames": true,
      "multipart.binaryPayloads": true,
      "multipart.boundaryCollisionPolicy": "reject-any-token-occurrence-in-payload",
      "multipart.nonAsciiFilenames": false,
      "multipart.customHeaders": false,
      "multipart.transmitsBody": false,
      "multipart.endpointAcceptanceVerified": false,
      "input.boundary.maxLength": 60,
      "input.boundary.minLength": 1,
      "input.parts.maxItems": 32,
      "input.parts.minItems": 1
    },
    "unknownPolicy": "Undeclared requirements are unknown, never compatible. Matching declared facts does not establish semantic fit or input validity.",
    "preflight": "/preflight"
  },
  "documentation": "/reference/tools/multipart-form-encode.md",
  "serviceContract": "/reference/services/multipart-form-encode.json",
  "errors": [
    {
      "status": 400,
      "meaning": "Malformed JSON, missing/invalid idempotency key, or payment identifier mismatch",
      "retry": "Correct the request before payment"
    },
    {
      "status": 402,
      "meaning": "Payment challenge or rejected payment",
      "retry": "Use official protocol SDK; inspect payment outcome before another payment"
    },
    {
      "status": 409,
      "meaning": "Idempotency conflict, duplicate proof, or PAYMENT_UNCERTAIN",
      "retry": "Keep original key, body, and proof; reconcile uncertainty with operator; never blindly repay"
    },
    {
      "status": 413,
      "meaning": "Input or generated output too large",
      "retry": "Reduce input; no payment attempted for validation failure"
    },
    {
      "status": 415,
      "meaning": "Unsupported media type or compression",
      "retry": "Send uncompressed application/json"
    },
    {
      "status": 422,
      "meaning": "Schema or service-specific semantic validation failure",
      "retry": "Correct input using returned error code; no payment attempted"
    },
    {
      "status": 429,
      "meaning": "Request/payment-attempt rate exceeded",
      "retry": "Wait for rate limit window; preserve existing payment identity"
    },
    {
      "status": 503,
      "meaning": "Payment configuration/provider/state unavailable, or live DNS preparation failed before settlement",
      "retry": "Check readiness; DNS preparation failures may retry the identical key/body/credential only; uncertainty requires reconciliation"
    }
  ],
  "numericPrecision": "JavaScript IEEE-754 numbers; use strings for large integer IDs/exact decimals where the schema accepts strings. No lossless numeric parsing.",
  "paymentWorkflow": {
    "discoveryOnly": false,
    "supportedProtocols": [
      "x402",
      "mpp"
    ],
    "x402": {
      "credentialHeader": "PAYMENT-SIGNATURE",
      "challengeHeader": "PAYMENT-REQUIRED",
      "receiptHeader": "PAYMENT-RESPONSE",
      "version": 2,
      "scheme": "exact",
      "paymentIdentifier": "payment-identifier extension MUST equal the HTTP Idempotency-Key",
      "sdk": "@x402/core with @x402/evm"
    },
    "mpp": {
      "supported": true,
      "credentialHeader": "Authorization",
      "challengeHeader": "WWW-Authenticate",
      "receiptHeader": "Payment-Receipt",
      "method": "tempo",
      "intent": "charge",
      "sdk": "mppx",
      "tokenDecimals": 6
    },
    "steps": [
      "Check configured readiness and the exact service schema",
      "Generate a fresh random Idempotency-Key for this operation; never use a discovery probe fixture for purchases",
      "Send valid input without a credential to obtain the official protocol challenge",
      "Use the official SDK and authorized wallet to fulfill the challenge",
      "Retry only with identical key, body, protocol and credential",
      "On PAYMENT_UNCERTAIN stop and request operator reconciliation; never blindly pay again"
    ],
    "versionedRetries": "Request fingerprint includes service release version. Retries across a version upgrade can conflict; coordinate upgrades outside the 24-hour replay window and reconcile pending attempts.",
    "docs": "/llms.txt"
  },
  "method": "POST",
  "paths": {
    "x402": "/v1/x402/multipart-form-encode",
    "mpp": "/v1/mpp/multipart-form-encode"
  },
  "inputSchema": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "boundary": {
        "type": "string",
        "minLength": 1,
        "maxLength": 60,
        "pattern": "^[A-Za-z0-9_-]+$"
      },
      "outputEncoding": {
        "type": "string",
        "enum": [
          "utf8",
          "base64"
        ]
      },
      "parts": {
        "minItems": 1,
        "maxItems": 32,
        "type": "array",
        "items": {
          "type": "object",
          "properties": {
            "name": {
              "type": "string",
              "minLength": 1,
              "maxLength": 64,
              "pattern": "^[\\x20-\\x21\\x23-\\x2e\\x30-\\x5b\\x5d-\\x7e]+$"
            },
            "filename": {
              "type": "string",
              "minLength": 1,
              "maxLength": 128,
              "pattern": "^[\\x20-\\x21\\x23-\\x2e\\x30-\\x5b\\x5d-\\x7e]+$"
            },
            "mediaType": {
              "type": "string",
              "minLength": 3,
              "maxLength": 127,
              "pattern": "^[A-Za-z0-9][A-Za-z0-9!#$&^_.+\\-]*\\/[A-Za-z0-9][A-Za-z0-9!#$&^_.+\\-]*$"
            },
            "encoding": {
              "type": "string",
              "enum": [
                "utf8",
                "base64"
              ]
            },
            "data": {
              "type": "string",
              "maxLength": 80000
            }
          },
          "required": [
            "name",
            "mediaType",
            "encoding",
            "data"
          ],
          "additionalProperties": false
        }
      }
    },
    "required": [
      "boundary",
      "outputEncoding",
      "parts"
    ],
    "additionalProperties": false
  },
  "outputSchema": {
    "type": "object",
    "required": [
      "operation",
      "version",
      "result",
      "provenance"
    ],
    "properties": {
      "operation": {
        "const": "multipart-form-encode",
        "type": "string"
      },
      "version": {
        "const": "0.29.0",
        "type": "string"
      },
      "result": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "type": "object",
        "properties": {
          "contentType": {
            "type": "string",
            "minLength": 31,
            "maxLength": 100
          },
          "encoding": {
            "type": "string",
            "enum": [
              "utf8",
              "base64"
            ]
          },
          "body": {
            "type": "string",
            "maxLength": 133336
          },
          "byteLength": {
            "type": "integer",
            "minimum": 1,
            "maximum": 100000
          },
          "partCount": {
            "type": "integer",
            "minimum": 1,
            "maximum": 32
          }
        },
        "required": [
          "contentType",
          "encoding",
          "body",
          "byteLength",
          "partCount"
        ],
        "additionalProperties": false
      },
      "provenance": {
        "type": "object",
        "required": [
          "inputSha256",
          "outputSha256",
          "deterministic",
          "externalRequests"
        ],
        "properties": {
          "inputSha256": {
            "type": "string",
            "pattern": "^[a-f0-9]{64}$"
          },
          "outputSha256": {
            "type": "string",
            "pattern": "^[a-f0-9]{64}$"
          },
          "deterministic": {
            "const": true
          },
          "externalRequests": {
            "const": 0
          }
        }
      }
    },
    "additionalProperties": false
  },
  "exampleInput": {
    "boundary": "b42",
    "outputEncoding": "utf8",
    "parts": [
      {
        "name": "file",
        "filename": "notes.txt",
        "mediaType": "text/plain",
        "encoding": "utf8",
        "data": "abc"
      }
    ]
  },
  "exampleResponse": {
    "operation": "multipart-form-encode",
    "version": "0.29.0",
    "result": {
      "contentType": "multipart/form-data; boundary=b42",
      "encoding": "utf8",
      "body": "--b42\r\nContent-Disposition: form-data; name=\"file\"; filename=\"notes.txt\"\r\nContent-Type: text/plain\r\n\r\nabc\r\n--b42--\r\n",
      "byteLength": 116,
      "partCount": 1
    },
    "provenance": {
      "inputSha256": "e22407bb1d5d4451adb5676aab25633a52b61787a22e1f399b608e6643546d39",
      "outputSha256": "dfa67a8c7d10639911e78caf05010359fbc718ebbbc7a4983d3f907c154ed739",
      "deterministic": true,
      "externalRequests": 0
    }
  },
  "requiredHeaders": {
    "Content-Type": "application/json",
    "Idempotency-Key": "random 16–128 character operation identifier"
  },
  "fixedExample": "/reference/examples/multipart-form-encode.json",
  "execution": {
    "deterministic": true,
    "externalRequests": 0,
    "maxExternalRequests": 0,
    "resultSnapshotPersisted": false,
    "fixedExampleIsIllustrativeSnapshot": false,
    "requiresPayment": true,
    "supportsMcpExecution": false
  },
  "releaseSnapshot": {
    "format": "static-release-reference-v1",
    "sourceVersion": "0.29.0",
    "sourceRegistrySha256": "a2b5ec09bf6c38b9d2879d746a4fded374f5928b445377b0270ef6aa8e6cac65",
    "generatedAt": "2026-10-06T15:38:00Z",
    "releaseAcceptance": "not-verified-by-generator",
    "runtimeReadiness": "not-evaluated",
    "livePaymentsVerified": false,
    "indexingVerified": false,
    "apiOrigin": null,
    "notice": "Build-time release reference. Runtime readiness, deployment, payment settlement and external indexing are not evaluated here. Prices are proposed; this file cannot authorize execution or payment."
  }
}