Telnyx x402 Cryptocurrency Payment

Fund a Telnyx account with USDC on the Base blockchain using the x402 payment protocol. The flow has three steps: get a quote, sign the payment client-side, and submit for settlement.

Feature Flag: x402 payments are gated behind the X402_PAYMENTS_ENABLED feature flag. If not enabled for the account, the API returns 403 Forbidden.

Prerequisites

• Telnyx API key (TELNYX_API_KEY)
• Crypto wallet with USDC on Base network (chain ID: eip155:8453)
• USDC contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Environment Variables

Step 1: Get a Quote