Agentic Payments

Add credits via MPP (Machine Payments Protocol)

post

Pay via MPP to add credits and obtain (or refresh) an API key, then call the standard /v1/openai/* endpoints with it as a Bearer token.

Payment rails: every challenge offers both, as two separate WWW-Authenticate header instances. Pay whichever one you can and retry with that rail's credential:

• Stripe (method="stripe"): pay with a Stripe card or Link Shared Payment Token. Retry with Authorization: Payment <stripe-credential>.

• Tempo (method="tempo"): pay with on-chain USDC on the Tempo network. Retry with Authorization: Payment <tempo-credential>.

Amount: defaults to $5.00; pass amount_cents to choose a size (clamped to the credit-purchase limits). Send the same amount_cents on the paid retry as on the challenge call.

Headers:

• Authorization: Payment <credential> — the MPP payment credential.

• X-API-Key: sk_… (optional) — refill an existing org; omit to mint a new org + key (returned once in the response body).

Body

amount_centsinteger · min: 100 · max: 1000000Optional

Top-up size in cents. Defaults to 500 ($5.00). Range $1.00–$10,000.00. Must be identical on the challenge call and the paid retry.

Default: 500

Responses

200

Successful Response

application/json

organization_idstringRequired

credited_centsintegerRequired

api_keystring · nullableOptional

api_key_idstring · nullableOptional

402

Payment required. Two WWW-Authenticate: Payment header instances are returned, one per supported rail (method="stripe" and method="tempo"), each quoting the top-up amount; pay either and retry.

422

Validation Error

application/json

post/v1/mpp/topup

POST /v1/mpp/topup HTTP/1.1
Host: api.lightningrod.ai
Content-Type: application/json
Accept: */*
Content-Length: 20

{
  "amount_cents": 500
}

{
  "organization_id": "text",
  "credited_cents": 1,
  "api_key": "text",
  "api_key_id": "text"
}