> ## Documentation Index > Fetch the complete documentation index at: https://developers.telnyx.com/llms.txt > Use this file to discover all available pages before exploring further. # Settle a payment > Settles an x402 payment using the quote ID and a signed payment authorization. The payment signature can be provided via the `PAYMENT-SIGNATURE` header or the `payment_signature` body parameter. Settlement is idempotent — submitting the same quote ID multiple times returns the existing transaction. ## OpenAPI ````yaml /openapi/source/external/payment/x402-transactions.json post /v2/x402/credit_account openapi: 3.0.0 info: version: 2.0.0 title: x402 Payment Transactions API contact: email: mission.control.squad@telnyx.com servers: - url: https://api.telnyx.com security: - bearerAuth: [] tags: - name: x402 Payment Transactions description: >- Operations for x402 cryptocurrency payment transactions. Fund your Telnyx account using USDC stablecoin payments via the x402 protocol. paths: /v2/x402/credit_account: post: tags: - x402 Payment Transactions summary: Settle a payment description: >- Settles an x402 payment using the quote ID and a signed payment authorization. The payment signature can be provided via the `PAYMENT-SIGNATURE` header or the `payment_signature` body parameter. Settlement is idempotent — submitting the same quote ID multiple times returns the existing transaction. operationId: settleX402Payment parameters: - name: PAYMENT-SIGNATURE in: header description: >- Signed payment authorization for the quote. Alternative to providing `payment_signature` in the request body. required: false schema: type: string requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/X402SettleRequest' example: id: quote_abc123 payment_signature: 0xabc123... responses: '200': description: Payment already settled (idempotent response) content: application/json: schema: $ref: '#/components/schemas/X402TransactionResponse' '201': description: Payment settled successfully content: application/json: schema: $ref: '#/components/schemas/X402TransactionResponse' example: data: id: de06811a-2e43-4561-af5a-7d0a26e20aaa record_type: x402_transaction amount: '50.00' currency: USD status: settled quote_id: quote_abc123 tx_hash: 0xabc123def456... created_at: '2026-03-13T15:00:00Z' '400': description: >- Bad request — invalid signature, expired authorization, invalid nonce, or malformed payment payload content: application/json: schema: $ref: '#/components/schemas/X402SettlementErrorResponse' examples: invalid_signature: summary: Invalid payment signature value: errors: - code: invalid_signature title: Payment Failed detail: >- Payment failed: the payment signature is invalid. Please sign a new payment authorization. expired_authorization: summary: Expired payment authorization value: errors: - code: expired_authorization title: Payment Failed detail: >- Payment failed: the payment authorization has expired. Please request a new quote and try again. '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: errors: - code: '10009' title: Authentication failed detail: >- The required authentication headers were either invalid or not included in the request. '403': description: >- Forbidden — x402 payments not enabled, account tier ineligible, or account suspended content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: errors: - code: '10010' title: Authorization failed detail: >- You do not have permission to perform the requested action on the specified resource or resources. '422': description: >- Unprocessable entity — missing required parameters or insufficient funds/allowance content: application/json: schema: $ref: '#/components/schemas/X402SettlementErrorResponse' examples: validation_error: summary: Missing required parameter value: errors: - code: unknown title: Invalid request detail: id is required insufficient_balance: summary: Insufficient wallet balance value: errors: - code: insufficient_balance title: Payment Failed detail: >- Payment failed: your wallet does not have enough USDC to complete this transaction. Please add funds and try again. '500': description: >- Internal server error — facilitator unavailable, transaction failed on-chain, or unknown error content: application/json: schema: $ref: '#/components/schemas/X402SettlementErrorResponse' example: errors: - code: transaction_failed title: Payment Failed detail: >- Payment transaction failed on-chain. Your funds have not been transferred. Please try again or contact support. '502': description: Bad gateway — upstream settlement service error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: errors: - code: '10007' title: Unexpected error detail: An unexpected error occured. '503': description: Service unavailable — facilitator or settlement timeout content: application/json: schema: $ref: '#/components/schemas/X402SettlementErrorResponse' example: errors: - code: facilitator_timeout title: Payment Failed detail: >- Payment processing timed out. Your funds have not been transferred. Please try again. x-codeSamples: - lang: JavaScript source: |- import Telnyx from 'telnyx'; const client = new Telnyx({ apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted }); const response = await client.x402.creditAccount.settle({ id: 'quote_abc123', payment_signature: '0xabc123...', }); console.log(response.data); - lang: Python source: | import os from telnyx import Telnyx client = Telnyx( api_key=os.environ.get("TELNYX_API_KEY"), # This is the default and can be omitted ) response = client.x402.credit_account.settle( id="quote_abc123", payment_signature="0xabc123...", ) print(response.data) - lang: Go source: "package main\n\nimport (\n\t\"context\"\n\t\"fmt\"\n\n\t\"github.com/team-telnyx/telnyx-go\"\n\t\"github.com/team-telnyx/telnyx-go/option\"\n)\n\nfunc main() {\n\tclient := telnyx.NewClient(\n\t\toption.WithAPIKey(\"My API Key\"),\n\t)\n\tresponse, err := client.X402.CreditAccount.Settle(context.TODO(), telnyx.X402CreditAccountSettleParams{\n\t\tID: \"quote_abc123\",\n\t\tPaymentSignature: telnyx.String(\"0xabc123...\"),\n\t})\n\tif err != nil {\n\t\tpanic(err.Error())\n\t}\n\tfmt.Printf(\"%+v\\n\", response.Data)\n}\n" - lang: Java source: >- package com.telnyx.sdk.example; import com.telnyx.sdk.client.TelnyxClient; import com.telnyx.sdk.client.okhttp.TelnyxOkHttpClient; import com.telnyx.sdk.models.x402.creditaccount.CreditAccountSettleParams; import com.telnyx.sdk.models.x402.creditaccount.CreditAccountSettleResponse; public final class Main { private Main() {} public static void main(String[] args) { TelnyxClient client = TelnyxOkHttpClient.fromEnv(); CreditAccountSettleParams params = CreditAccountSettleParams.builder() .id("quote_abc123") .build(); CreditAccountSettleResponse response = client.x402().creditAccount().settle(params); } } - lang: Ruby source: |- require "telnyx" telnyx = Telnyx::Client.new(api_key: "My API Key") response = telnyx.x402.credit_account.settle(id: "quote_abc123") puts(response) - lang: PHP source: >- x402->creditAccount->settle( id: 'quote_abc123', paymentSignature: '0xabc123...', headerPaymentSignature: 'PAYMENT-SIGNATURE', ); var_dump($response); } catch (APIException $e) { echo $e->getMessage(); } - lang: CLI source: |- telnyx x402:credit-account settle \ --api-key 'My API Key' \ --id quote_abc123 components: schemas: X402SettleRequest: type: object required: - id properties: id: type: string description: The quote ID to settle. payment_signature: type: string description: >- Base64-encoded signed payment authorization (x402 PaymentPayload). Can alternatively be provided via the PAYMENT-SIGNATURE header. X402TransactionResponse: type: object properties: data: type: object properties: id: type: string description: Unique transaction identifier. record_type: type: string enum: - x402_transaction amount: type: string description: The transaction amount in the specified currency. currency: type: string description: The currency of the transaction amount (e.g. USD). status: type: string description: The settlement status of the transaction. enum: - settled quote_id: type: string description: The original quote ID associated with this transaction. tx_hash: type: string nullable: true description: The on-chain transaction hash, if available. created_at: type: string format: date-time description: ISO 8601 timestamp when the transaction was created. X402SettlementErrorResponse: type: object description: >- Error response for x402 settlement failures. Uses string error codes from the x402 error handling system. properties: errors: type: array items: type: object properties: code: type: string description: Machine-readable error code. enum: - invalid_signature - expired_authorization - invalid_nonce - insufficient_balance - insufficient_funds - insufficient_allowance - facilitator_unavailable - facilitator_timeout - settlement_timeout - transaction_failed - unknown title: type: string description: Short error title (e.g. "Payment Failed"). detail: type: string description: Human-readable error description with guidance. ErrorResponse: type: object properties: errors: type: array items: type: object properties: code: type: string title: type: string detail: type: string meta: type: object properties: url: type: string source: type: object properties: pointer: type: string securitySchemes: bearerAuth: type: http scheme: bearer ````