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Payment Sessions

Authorize a payment session with x402

Changed on

Customer-initiated. Authorizes a payment session using x402. The payer supplies the payment payload, so this call is unauthenticated. The session must be in created status.

The client sends no request body. You may supply the base64-encoded x402-compliant payment payload in the optional PAYMENT-SIGNATURE header.

On authorization, a hold is placed on the payer's funds. The authorization is returned in pending status and transitions asynchronously to succeeded or failed.

402 Payment Required may be returned when payment must be supplied before authorization can proceed. The 402 response uses the standard CDP Error JSON body and may include a PAYMENT-REQUIRED header (see the 402 response) describing accepted networks, assets, and amounts.

If autoCapture is enabled on the session, a capture is automatically created after a successful authorization.

post/v2/payment-sessions/{paymentSessionId}/authorizations/x402

Request

  • Base URL: https://api.cdp.coinbase.com/platform
  • URL: https://api.cdp.coinbase.com/platform/v2/payment-sessions/{paymentSessionId}/authorizations/x402
  • Auth: HTTP none

Path parameters

paymentSessionIdstring required

The ID of the payment session, a UUID prefixed by paymentSession_.

Example:paymentSession_82c879c1-84e1-44ed-a8c2-1ac239cf09ad

The unique identifier of the payment session to authorize with x402.

Headers

PAYMENT-SIGNATUREstring

Optional. Base64-encoded (RFC 4648) x402-compliant payment payload.

X-External-Reference-Idstring

A merchant-provided internal identifier for a resource from the merchant's own system—not visible to the payer. It must not contain personally identifiable information (PII) or payment credentials.

Example:merchant-reference-abc123

An optional merchant-provided internal identifier for this x402 authorization, from the merchant's own system—not visible to the payer.

X-Customer-Display-Reference-Codestring

A short customer-facing reference for an operation, visible to the payer. It must not contain personally identifiable information (PII) or payment credentials.

Example:REF-ABC123

A short customer-facing reference code for this x402 authorization, visible to the payer. Equivalent to customerDisplay.referenceCode on JSON authorization requests. Falls back to the session's orderCode when omitted.

X-Idempotency-Keystring

An optional string request header for making requests safely retryable. When included, duplicate requests with the same key will return identical responses. Refer to our Idempotency docs for more information on using idempotency keys.

Response

Successfully created x402 authorization. The PAYMENT-RESPONSE header is always included on 200 responses.

authorizationIdstring

The ID of the authorization, a UUID prefixed by authorization_.

paymentSessionIdstring

The ID of the payment session, a UUID prefixed by paymentSession_.

status'pending' | 'succeeded' | 'failed'

The current status of a payment action (authorization, capture, void, or refund).

amountstring

A decimal representation of the authorized amount, denominated in the session's asset.

messagestring

A human-readable message describing the outcome or status for display. Returned for x402 authorizations; omitted for other authorization flows unless documented otherwise.

metadataMetadata

Optional metadata as key-value pairs. Use this to store additional structured information on a resource, such as customer IDs, order references, or any application-specific data. Up to 10 key/value pairs may be provided. Keys and values are both strings. Keys must be ≤ 40 characters; values must be ≤ 500 characters.

externalReferenceIdstring

A merchant-provided internal identifier for a resource from the merchant's own system—not visible to the payer. It must not contain personally identifiable information (PII) or payment credentials.

createdAtstring date-time

The UTC ISO 8601 timestamp at which the authorization was created.

updatedAtstring date-time

The UTC ISO 8601 timestamp at which the authorization was last updated.

Example response

{
  "authorizationId": "authorization_82c879c1-84e1-44ed-a8c2-1ac239cf09ad",
  "paymentSessionId": "paymentSession_82c879c1-84e1-44ed-a8c2-1ac239cf09ad",
  "status": "succeeded",
  "amount": "1.00",
  "source": {
    "address": "0xAbC1234567890aBcDeF1234567890AbCdEf123456",
    "network": "base",
    "asset": "usdc"
  },
  "onchainTransactions": [
    {
      "transactionHash": "0xabc123def456789012345678901234567890abcdef1234567890abcdef123456",
      "network": "base"
    }
  ],
  "metadata": {
    "customer_id": "cust_12345"
  },
  "createdAt": "2025-06-15T12:00:00.000Z",
  "updatedAt": "2025-06-15T12:01:00.000Z"
}

Changes

  • 156440e9f8dfRevision changes
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  • 229ed860a74bRevision changes
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