Public key discovery endpoints for Message-Level Encryption.
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openapi: 3.2.0
info:
title: Method Public Keys API
version: '2025-12-01'
license:
name: Proprietary
url: https://methodfi.com
description: 'The Method API enables you to retrieve financial data, create payments, and manage
entities and accounts programmatically.'
contact:
name: Method Financial
url: https://methodfi.com
email: team@methodfi.com
servers:
- url: https://production.methodfi.com
description: Production
- url: https://sandbox.methodfi.com
description: Sandbox
- url: https://dev.methodfi.com
description: Development
security:
- SecretKey: []
tags:
- name: Public Keys
description: Public key discovery endpoints for Message-Level Encryption.
paths:
/.well-known/jwks.json:
get:
operationId: listPublicJwks
summary: List public JWKs
description: Returns the currently active Method public keys for Message-Level Encryption.
tags:
- Public Keys
security: []
responses:
'200':
description: Public JWK set for Method encryption.
headers:
Cache-Control:
description: Caching directive for the public JWK set.
schema:
type: string
example: public, max-age=3600
content:
application/json:
schema:
$ref: '#/components/schemas/WellKnownJwksResponse'
example:
keys:
- kid: mthd_jwk_abc123
kty: RSA
alg: RSA-OAEP-256
use: enc
n: sXchf3Hj7G6m1mQF2k38QeY7s9lQfV4sLzM0YJr7Q7B6U2CjQX8m5w
e: AQAB
'400':
$ref: '#/components/responses/BadRequest'
'500':
$ref: '#/components/responses/InternalError'
/auth/{jwk_id}:
get:
operationId: retrievePublicJwk
summary: Retrieve a public JWK
description: Returns a single Method public key by identifier for Message-Level Encryption.
tags:
- Public Keys
security: []
parameters:
- $ref: '#/components/parameters/MethodJwkIdParam'
responses:
'200':
description: The requested public JWK.
headers:
Cache-Control:
description: Caching directive for the public JWK.
schema:
type: string
example: public, max-age=3600
content:
application/json:
schema:
$ref: '#/components/schemas/MethodPublicKeyResponse'
example:
success: true
data:
id: mthd_jwk_abc123
jwk:
kid: mthd_jwk_abc123
kty: RSA
alg: RSA-OAEP-256
use: enc
n: sXchf3Hj7G6m1mQF2k38QeY7s9lQfV4sLzM0YJr7Q7B6U2CjQX8m5w
e: AQAB
jwk_thumbprint: qn0x2fG8X0F9S9RzM1Tq8vQw8ap8T7iWmS0o9C9y4Lw
status: active
created_at: '2026-01-15T18:30:00.000Z'
updated_at: '2026-01-15T18:30:00.000Z'
message: null
'404':
$ref: '#/components/responses/NotFound'
'500':
$ref: '#/components/responses/InternalError'
components:
responses:
InternalError:
description: Internal server error.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorEnvelope'
NotFound:
description: Not found - the requested resource does not exist.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorEnvelope'
BadRequest:
description: Bad request - invalid parameters or request body.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorEnvelope'
schemas:
ErrorEnvelope:
type: object
required:
- success
- data
- message
properties:
success:
type: boolean
description: Always `false` for error responses.
data:
type: object
required:
- error
properties:
error:
$ref: '#/components/schemas/ErrorObject'
message:
type: string
MethodPublicKey:
type: object
required:
- id
- jwk
- jwk_thumbprint
- status
- created_at
- updated_at
properties:
id:
type: string
description: Unique identifier for the Method JWK.
pattern: ^mthd_jwk_\w+$
jwk:
$ref: '#/components/schemas/JwkPublic'
jwk_thumbprint:
type: string
description: SHA-256 thumbprint for the public JWK.
status:
type: string
description: Lifecycle status of the public key.
enum:
- active
- deprecated
- disabled
created_at:
type: string
format: date-time
description: Timestamp when the key was created.
updated_at:
type: string
format: date-time
description: Timestamp when the key was last updated.
SuccessEnvelope:
type: object
description: Standard envelope for successful responses that return a single payload.
required:
- success
- data
- message
properties:
success:
type: boolean
description: Always `true` for successful responses.
data:
description: Operation-specific response payload.
message:
type:
- string
- 'null'
example:
success: true
data: {}
message: null
MethodPublicKeyResponse:
allOf:
- $ref: '#/components/schemas/SuccessEnvelope'
- type: object
properties:
data:
$ref: '#/components/schemas/MethodPublicKey'
JwkPublic:
type: object
required:
- kid
- kty
- alg
- use
- n
- e
properties:
kid:
type: string
description: Key identifier.
example: mthd_jwk_abc123
kty:
type: string
description: Key type.
example: RSA
alg:
type: string
description: JWK algorithm.
example: RSA-OAEP-256
use:
type: string
description: Intended key use.
example: enc
n:
type: string
description: RSA modulus.
e:
type: string
description: RSA public exponent.
ErrorObject:
type: object
required:
- type
- code
- message
properties:
type:
type: string
description: Error type category.
enum:
- invalid_request
- api_error
- resource_error
code:
type: integer
description: Numeric error code. Common codes include 400 (bad request), 401 (unauthorized), 403 (forbidden), 404 (not found), 422 (unprocessable entity), 429 (rate limited), and 500 (internal error).
sub_type:
type:
- string
- 'null'
description: More specific error classification.
message:
type: string
description: Human-readable error description.
WellKnownJwksResponse:
type: object
required:
- keys
properties:
keys:
type: array
items:
$ref: '#/components/schemas/JwkPublic'
parameters:
MethodJwkIdParam:
name: jwk_id
in: path
required: true
description: Unique identifier for the Method public JWK.
schema:
type: string
pattern: ^mthd_jwk_\w+$
securitySchemes:
OpalToken:
type: http
scheme: bearer
description: 'Opal token authentication for Opal session endpoints. Use an Opal token (`otkn_...`)
as the Bearer token. Created via POST /opal/token using a secret key.
'
SecretKey:
type: http
scheme: bearer
description: 'Secret key authentication. Use your team''s secret key (`sk_...`) as the Bearer token.
All authenticated API endpoints require this scheme unless otherwise noted.
'