FluentEDI Crypto API

openapi: 3.2.0
info:
  title: FluentEDI Crypto API
  version: 1.1.0
  summary: Deterministic tools for AI agents. No key, no signup, no SDK.
  description: 'A public HTTP API of deterministic tools for the work a language model cannot do reliably by reasoning: knowing the current time in any timezone and whether an instant falls inside a window, exact arithmetic, hashing and signature verification, canonicalizing and content-addressing JSON, repairing malformed JSON and pinpointing where it broke, querying and diffing structured data, parsing CSV correctly, converting units, colours and currencies at live ECB rates, testing regular expressions…'
  license:
    name: Free to use
    identifier: MIT
servers:
- url: https://fluentedi.com
tags:
- name: Crypto
  description: Hashing, signatures, encoding and identifiers
paths:
  /v1/hash:
    get:
      operationId: hash_get
      summary: Hash or HMAC-sign text with MD5, SHA-1, SHA-256/384/512 or CRC32
      description: Computes cryptographic digests and HMAC signatures. Returns hex and base64 at once, so a webhook signature can be compared in whichever encoding the provider uses. MD5 and CRC32 are included for checksums and legacy fixtures; they are not secure for authentication.
      tags:
      - Crypto
      parameters:
      - name: input
        in: query
        required: true
        description: Text to hash.
        schema:
          description: Text to hash.
          type: string
          maxLength: 200000
          examples:
          - hello world
      - name: algorithms
        in: query
        required: false
        description: 'Any of: md5, sha1, sha256, sha384, sha512, crc32.'
        schema:
          description: 'Any of: md5, sha1, sha256, sha384, sha512, crc32.'
          type: array
          default:
          - sha256
          items:
            type: string
          examples:
          - - sha256
            - md5
      - name: hmac_key
        in: query
        required: false
        description: When set, computes HMAC-<algorithm> with this key instead of a plain digest. Not supported for md5/crc32.
        schema:
          description: When set, computes HMAC-<algorithm> with this key instead of a plain digest. Not supported for md5/crc32.
          type: string
          default: ''
          maxLength: 4096
      - name: input_encoding
        in: query
        required: false
        description: How to read `input` into bytes.
        schema:
          description: How to read `input` into bytes.
          type: string
          enum:
          - utf8
          - hex
          - base64
          default: utf8
      responses:
        '200':
          description: Tool result.
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  tool:
                    type: string
                  result:
                    type: object
                    description: Tool-specific result payload.
        '400':
          description: Invalid input. The body carries the parameter schema and working examples.
    post:
      operationId: hash_post
      summary: Hash or HMAC-sign text with MD5, SHA-1, SHA-256/384/512 or CRC32
      description: Computes cryptographic digests and HMAC signatures. Returns hex and base64 at once, so a webhook signature can be compared in whichever encoding the provider uses. MD5 and CRC32 are included for checksums and legacy fixtures; they are not secure for authentication.
      tags:
      - Crypto
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                input:
                  description: Text to hash.
                  type: string
                  maxLength: 200000
                  examples:
                  - hello world
                algorithms:
                  description: 'Any of: md5, sha1, sha256, sha384, sha512, crc32.'
                  type: array
                  default:
                  - sha256
                  items:
                    type: string
                  examples:
                  - - sha256
                    - md5
                hmac_key:
                  description: When set, computes HMAC-<algorithm> with this key instead of a plain digest. Not supported for md5/crc32.
                  type: string
                  default: ''
                  maxLength: 4096
                input_encoding:
                  description: How to read `input` into bytes.
                  type: string
                  enum:
                  - utf8
                  - hex
                  - base64
                  default: utf8
              required:
              - input
              additionalProperties: false
      responses:
        '200':
          description: Tool result.
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  tool:
                    type: string
                  result:
                    type: object
                    description: Tool-specific result payload.
        '400':
          description: Invalid input. The body carries the parameter schema and working examples.
  /v1/crypto/verify:
    get:
      operationId: crypto_verify_get
      summary: Verify an Ed25519, ECDSA, RSA or HMAC signature against a message and public key
      description: Checks a detached signature and returns a single boolean you can act on. Signature verification is not something to reason about — a signature is either valid under the key or it is not, and an agent that accepts an identity claim without checking has accepted anything. Supports Ed25519 (raw 32-byte or SPKI keys), ECDSA P-256/P-384, RSA PKCS#1 v1.5 and PSS, and HMAC-SHA256/512.
      tags:
      - Crypto
      parameters:
      - name: message
        in: query
        required: true
        description: The signed message.
        schema:
          description: The signed message.
          type: string
          maxLength: 200000
      - name: signature
        in: query
        required: true
        description: The detached signature.
        schema:
          description: The detached signature.
          type: string
          maxLength: 8000
      - name: public_key
        in: query
        required: true
        description: 'Public key: raw bytes, SPKI DER, or PEM. For HMAC, the shared secret.'
        schema:
          description: 'Public key: raw bytes, SPKI DER, or PEM. For HMAC, the shared secret.'
          type: string
          maxLength: 8000
      - name: algorithm
        in: query
        required: false
        description: Signature algorithm.
        schema:
          description: Signature algorithm.
          type: string
          enum:
          - ed25519
          - ecdsa-p256
          - ecdsa-p384
          - rsa-pkcs1
          - rsa-pss
          - hmac-sha256
          - hmac-sha512
          default: ed25519
      - name: message_encoding
        in: query
        required: false
        description: How to read `message` into bytes.
        schema:
          description: How to read `message` into bytes.
          type: string
          enum:
          - utf8
          - hex
          - base64
          default: utf8
      - name: signature_encoding
        in: query
        required: false
        description: How to read `signature` into bytes.
        schema:
          description: How to read `signature` into bytes.
          type: string
          enum:
          - hex
          - base64
          - utf8
          default: hex
      - name: key_encoding
        in: query
        required: false
        description: How to read `public_key` when it is not PEM.
        schema:
          description: How to read `public_key` when it is not PEM.
          type: string
          enum:
          - hex
          - base64
          - utf8
          default: hex
      responses:
        '200':
          description: Tool result.
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  tool:
                    type: string
                  result:
                    type: object
                    description: Tool-specific result payload.
        '400':
          description: Invalid input. The body carries the parameter schema and working examples.
    post:
      operationId: crypto_verify_post
      summary: Verify an Ed25519, ECDSA, RSA or HMAC signature against a message and public key
      description: Checks a detached signature and returns a single boolean you can act on. Signature verification is not something to reason about — a signature is either valid under the key or it is not, and an agent that accepts an identity claim without checking has accepted anything. Supports Ed25519 (raw 32-byte or SPKI keys), ECDSA P-256/P-384, RSA PKCS#1 v1.5 and PSS, and HMAC-SHA256/512.
      tags:
      - Crypto
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                message:
                  description: The signed message.
                  type: string
                  maxLength: 200000
                signature:
                  description: The detached signature.
                  type: string
                  maxLength: 8000
                public_key:
                  description: 'Public key: raw bytes, SPKI DER, or PEM. For HMAC, the shared secret.'
                  type: string
                  maxLength: 8000
                algorithm:
                  description: Signature algorithm.
                  type: string
                  enum:
                  - ed25519
                  - ecdsa-p256
                  - ecdsa-p384
                  - rsa-pkcs1
                  - rsa-pss
                  - hmac-sha256
                  - hmac-sha512
                  default: ed25519
                message_encoding:
                  description: How to read `message` into bytes.
                  type: string
                  enum:
                  - utf8
                  - hex
                  - base64
                  default: utf8
                signature_encoding:
                  description: How to read `signature` into bytes.
                  type: string
                  enum:
                  - hex
                  - base64
                  - utf8
                  default: hex
                key_encoding:
                  description: How to read `public_key` when it is not PEM.
                  type: string
                  enum:
                  - hex
                  - base64
                  - utf8
                  default: hex
              required:
              - message
              - signature
              - public_key
              additionalProperties: false
      responses:
        '200':
          description: Tool result.
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  tool:
                    type: string
                  result:
                    type: object
                    description: Tool-specific result payload.
        '400':
          description: Invalid input. The body carries the parameter schema and working examples.
  /v1/jwt/decode:
    get:
      operationId: jwt_decode_get
      summary: Decode a JWT and check its expiry, optionally verifying an HMAC signature
      description: Splits a JSON Web Token, decodes header and payload, and converts every standard time claim (exp, iat, nbf, auth_time) into readable dates with a live expiry verdict. Supply `secret` to verify an HS256/384/512 signature. Decoding never validates trust on its own — an unverified token is just base64 text that anyone can forge.
      tags:
      - Crypto
      parameters:
      - name: token
        in: query
        required: true
        description: The JWT (three base64url segments separated by dots). A leading "Bearer " is ignored.
        schema:
          description: The JWT (three base64url segments separated by dots). A leading "Bearer " is ignored.
          type: string
          maxLength: 100000
      - name: secret
        in: query
        required: false
        description: HMAC secret. When provided, the signature is verified for HS256/HS384/HS512.
        schema:
          description: HMAC secret. When provided, the signature is verified for HS256/HS384/HS512.
          type: string
          default: ''
          maxLength: 4096
      responses:
        '200':
          description: Tool result.
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  tool:
                    type: string
                  result:
                    type: object
                    description: Tool-specific result payload.
        '400':
          description: Invalid input. The body carries the parameter schema and working examples.
    post:
      operationId: jwt_decode_post
      summary: Decode a JWT and check its expiry, optionally verifying an HMAC signature
      description: Splits a JSON Web Token, decodes header and payload, and converts every standard time claim (exp, iat, nbf, auth_time) into readable dates with a live expiry verdict. Supply `secret` to verify an HS256/384/512 signature. Decoding never validates trust on its own — an unverified token is just base64 text that anyone can forge.
      tags:
      - Crypto
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                token:
                  description: The JWT (three base64url segments separated by dots). A leading "Bearer " is ignored.
                  type: string
                  maxLength: 100000
                secret:
                  description: HMAC secret. When provided, the signature is verified for HS256/HS384/HS512.
                  type: string
                  default: ''
                  maxLength: 4096
              required:
              - token
              additionalProperties: false
      responses:
        '200':
          description: Tool result.
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  tool:
                    type: string
                  result:
                    type: object
                    description: Tool-specific result payload.
        '400':
          description: Invalid input. The body carries the parameter schema and working examples.
  /v1/encode:
    get:
      operationId: encode_get
      summary: Convert text between base64, base64url, hex, URL and HTML encodings
      description: Round-trips a value between encodings in one call. Handles base64url (JWT-style, no padding) and distinguishes full-URI encoding from component encoding, which is the usual cause of double-encoded query strings.
      tags:
      - Crypto
      parameters:
      - name: input
        in: query
        required: true
        description: Value to convert.
        schema:
          description: Value to convert.
          type: string
          maxLength: 500000
          examples:
          - hello world
      - name: from
        in: query
        required: false
        description: Encoding of the input.
        schema:
          description: Encoding of the input.
          type: string
          enum:
          - text
          - base64
          - base64url
          - hex
          - url
          - url_component
          - html
          default: text
      - name: to
        in: query
        required: false
        description: Encoding to produce.
        schema:
          description: Encoding to produce.
          type: string
          enum:
          - text
          - base64
          - base64url
          - hex
          - url
          - url_component
          - html
          default: base64
      responses:
        '200':
          description: Tool result.
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  tool:
                    type: string
                  result:
                    type: object
                    description: Tool-specific result payload.
        '400':
          description: Invalid input. The body carries the parameter schema and working examples.
    post:
      operationId: encode_post
      summary: Convert text between base64, base64url, hex, URL and HTML encodings
      description: Round-trips a value between encodings in one call. Handles base64url (JWT-style, no padding) and distinguishes full-URI encoding from component encoding, which is the usual cause of double-encoded query strings.
      tags:
      - Crypto
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                input:
                  description: Value to convert.
                  type: string
                  maxLength: 500000
                  examples:
                  - hello world
                from:
                  description: Encoding of the input.
                  type: string
                  enum:
                  - text
                  - base64
                  - base64url
                  - hex
                  - url
                  - url_component
                  - html
                  default: text
                to:
                  description: Encoding to produce.
                  type: string
                  enum:
                  - text
                  - base64
                  - base64url
                  - hex
                  - url
                  - url_component
                  - html
                  default: base64
              required:
              - input
              additionalProperties: false
      responses:
        '200':
          description: Tool result.
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  tool:
                    type: string
                  result:
                    type: object
                    description: Tool-specific result payload.
        '400':
          description: Invalid input. The body carries the parameter schema and working examples.
  /v1/id/generate:
    get:
      operationId: id_generate_get
      summary: Generate UUIDv4, UUIDv7, ULID, nanoid or short random IDs
      description: Cryptographically random identifiers from the edge. UUIDv7 and ULID embed a millisecond timestamp and sort lexicographically in creation order, which makes them the right default for database primary keys; UUIDv4 is fully random and does not sort. The embedded timestamp is decoded back for you.
      tags:
      - Crypto
      parameters:
      - name: type
        in: query
        required: false
        description: Identifier format.
        schema:
          description: Identifier format.
          type: string
          enum:
          - uuid4
          - uuid7
          - ulid
          - nanoid
          - hex
          - numeric
          default: uuid4
      - name: count
        in: query
        required: false
        description: How many to generate.
        schema:
          description: How many to generate.
          type: integer
          default: 1
          minimum: 1
          maximum: 500
      - name: length
        in: query
        required: false
        description: Length for nanoid, hex and numeric types.
        schema:
          description: Length for nanoid, hex and numeric types.
          type: integer
          default: 21
          minimum: 1
          maximum: 256
      - name: uppercase
        in: query
        required: false
        description: Uppercase the output where the format allows it.
        schema:
          description: Uppercase the output where the format allows it.
          type: boolean
          default: false
      responses:
        '200':
          description: Tool result.
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  tool:
                    type: string
                  result:
                    type: object
                    description: Tool-specific result payload.
        '400':
          description: Invalid input. The body carries the parameter schema and working examples.
    post:
      operationId: id_generate_post
      summary: Generate UUIDv4, UUIDv7, ULID, nanoid or short random IDs
      description: Cryptographically random identifiers from the edge. UUIDv7 and ULID embed a millisecond timestamp and sort lexicographically in creation order, which makes them the right default for database primary keys; UUIDv4 is fully random and does not sort. The embedded timestamp is decoded back for you.
      tags:
      - Crypto
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              properties:
                type:
                  description: Identifier format.
                  type: string
                  enum:
                  - uuid4
                  - uuid7
                  - ulid
                  - nanoid
                  - hex
                  - numeric
                  default: uuid4
                count:
                  description: How many to generate.
                  type: integer
                  default: 1
                  minimum: 1
                  maximum: 500
                length:
                  description: Length for nanoid, hex and numeric types.
                  type: integer
                  default: 21
                  minimum: 1
                  maximum: 256
                uppercase:
                  description: Uppercase the output where the format allows it.
                  type: boolean
                  default: false
              required: []
              additionalProperties: false
      responses:
        '200':
          description: Tool result.
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                  tool:
                    type: string
                  result:
                    type: object
                    description: Tool-specific result payload.
        '400':
          description: Invalid input. The body carries the parameter schema and working examples.