NEAR Protocol public-key API

openapi: 3.0.3
info:
  description: Low-latency indexed account, token, and public-key lookup APIs for wallets and explorers. Embedded portal clients may forward an optional `apiKey` query parameter, but the public FastNEAR API does not require it.
  title: FastNEAR accounts public-key API
  version: 3.0.3
servers:
- description: Mainnet
  url: https://api.fastnear.com
- description: Testnet
  url: https://test.api.fastnear.com
tags:
- name: public-key
paths:
  /v0/public_key/{public_key}:
    get:
      description: Fetch the account IDs that have registered a full-access public key, via the legacy V0 lookup path.
      operationId: lookup_by_public_key_v0
      parameters:
      - description: NEAR public key in `ed25519:...` or `secp256k1:...` form.
        example: ed25519:CCaThr3uokqnUs6Z5vVnaDcJdrfuTpYJHJWcAGubDjT
        in: path
        name: public_key
        required: true
        schema:
          type: string
      - description: Optional API key forwarded by embedded portal clients. The public FastNEAR API does not require it.
        in: query
        name: apiKey
        required: false
        schema:
          type: string
      responses:
        '200':
          content:
            application/json:
              example:
                account_ids:
                - root.near
                public_key: ed25519:CCaThr3uokqnUs6Z5vVnaDcJdrfuTpYJHJWcAGubDjT
              schema:
                $ref: '#/components/schemas/PublicKeyLookupResponse'
          description: Matching account IDs for the supplied full-access public key
        '400':
          content:
            application/json:
              schema:
                type: string
          description: Bad Request
        '500':
          content:
            application/json:
              schema:
                type: string
          description: Internal Server Error
      summary: Lookup full-access accounts by public key
      tags:
      - public-key
      x-fastnear-slug: public_key_lookup
      x-fastnear-title: FastNEAR API - V0 Public Key Lookup
  /v0/public_key/{public_key}/all:
    get:
      description: List every account tied to a public key — full-access and limited-access keys together — via the legacy V0 lookup-all path.
      operationId: lookup_by_public_key_all_v0
      parameters:
      - description: NEAR public key in `ed25519:...` or `secp256k1:...` form.
        example: ed25519:CCaThr3uokqnUs6Z5vVnaDcJdrfuTpYJHJWcAGubDjT
        in: path
        name: public_key
        required: true
        schema:
          type: string
      - description: Optional API key forwarded by embedded portal clients. The public FastNEAR API does not require it.
        in: query
        name: apiKey
        required: false
        schema:
          type: string
      responses:
        '200':
          content:
            application/json:
              example:
                account_ids:
                - root.near
                public_key: ed25519:CCaThr3uokqnUs6Z5vVnaDcJdrfuTpYJHJWcAGubDjT
              schema:
                $ref: '#/components/schemas/PublicKeyLookupResponse'
          description: Matching account IDs for the supplied public key, including limited-access keys
        '400':
          content:
            application/json:
              schema:
                type: string
          description: Bad Request
        '500':
          content:
            application/json:
              schema:
                type: string
          description: Internal Server Error
      summary: Lookup all indexed accounts by public key
      tags:
      - public-key
      x-fastnear-slug: public_key_lookup_all
      x-fastnear-title: FastNEAR API - V0 Public Key Lookup (All)
  /v1/public_key/{public_key}:
    get:
      description: Resolve a full-access public key to the indexed NEAR accounts that have registered it — V1 canonical lookup path.
      operationId: lookup_by_public_key_v1
      parameters:
      - description: NEAR public key in `ed25519:...` or `secp256k1:...` form.
        example: ed25519:CCaThr3uokqnUs6Z5vVnaDcJdrfuTpYJHJWcAGubDjT
        in: path
        name: public_key
        required: true
        schema:
          type: string
      - description: Optional API key forwarded by embedded portal clients. The public FastNEAR API does not require it.
        in: query
        name: apiKey
        required: false
        schema:
          type: string
      responses:
        '200':
          content:
            application/json:
              example:
                account_ids:
                - root.near
                public_key: ed25519:CCaThr3uokqnUs6Z5vVnaDcJdrfuTpYJHJWcAGubDjT
              schema:
                $ref: '#/components/schemas/PublicKeyLookupResponse'
          description: Matching account IDs for the supplied full-access public key
        '400':
          content:
            application/json:
              schema:
                type: string
          description: Bad Request
        '500':
          content:
            application/json:
              schema:
                type: string
          description: Internal Server Error
      summary: Lookup full-access accounts by public key
      tags:
      - public-key
      x-fastnear-slug: public_key_lookup
      x-fastnear-title: FastNEAR API - V1 Public Key Lookup
  /v1/public_key/{public_key}/all:
    get:
      description: Resolve a public key to every account that holds it — full-access and limited-access keys alike — via the V1 lookup-all path.
      operationId: lookup_by_public_key_all_v1
      parameters:
      - description: NEAR public key in `ed25519:...` or `secp256k1:...` form.
        example: ed25519:CCaThr3uokqnUs6Z5vVnaDcJdrfuTpYJHJWcAGubDjT
        in: path
        name: public_key
        required: true
        schema:
          type: string
      - description: Optional API key forwarded by embedded portal clients. The public FastNEAR API does not require it.
        in: query
        name: apiKey
        required: false
        schema:
          type: string
      responses:
        '200':
          content:
            application/json:
              example:
                account_ids:
                - root.near
                public_key: ed25519:CCaThr3uokqnUs6Z5vVnaDcJdrfuTpYJHJWcAGubDjT
              schema:
                $ref: '#/components/schemas/PublicKeyLookupResponse'
          description: Matching account IDs for the supplied public key, including limited-access keys
        '400':
          content:
            application/json:
              schema:
                type: string
          description: Bad Request
        '500':
          content:
            application/json:
              schema:
                type: string
          description: Internal Server Error
      summary: Lookup all indexed accounts by public key
      tags:
      - public-key
      x-fastnear-slug: public_key_lookup_all
      x-fastnear-title: FastNEAR API - V1 Public Key Lookup (All)
components:
  schemas:
    PublicKeyLookupResponse:
      additionalProperties: false
      properties:
        account_ids:
          items:
            type: string
          type: array
        public_key:
          type: string
      required:
      - public_key
      - account_ids
      type: object