Pay-per-request APIs and programmable payments for agents, applications, and developers.
Explore X Pay → · API catalog · Follow on X
X Pay connects paid API access with on-chain payments. Explore utility and AI endpoints, inspect payment requirements, and build software that can pay for the services it uses.
| Use paid APIs | Integrate payments | Explore the ecosystem |
|---|---|---|
| Discover available resources and request formats. | Inspect the facilitator’s advertised capabilities. | Follow our public integrations and listing records. |
| Browse APIs → | View capabilities → | View directory profile → |
1 · Discover — Browse the API catalog or read its OpenAPI specification.
2 · Inspect — Check the resource’s payment requirements and the facilitator’s supported networks and assets.
3 · Get access — Sign in to the dashboard, verify your email and generate a dedicated facilitator key.
4 · Integrate — Use an x402-compatible client to authorize payment and request the resource. Check endpoint pricing before making paid requests.
| Interface | Details |
|---|---|
| Protocol | x402 v2 · exact scheme |
| Base mainnet | eip155:8453 · USDC · 6 decimals · EIP-3009 |
| BNB mainnet | eip155:56 · Binance-Peg USDC · 18 decimals · Permit2 |
| Facilitator | facilitator-xpay.llc |
| Service catalog | api-xpay.com |
Check current capabilities for Base and BNB before integrating. Dedicated facilitator API keys are required for verification and settlement; capability endpoints are public. Generate a key through Dashboard → Facilitator Access.
Merchant integration guide → · Hosted documentation · Get a facilitator API key
The guide covers authentication, network endpoints, payment verification, settlement, error handling and existing settlement evidence. The live reference includes token contracts and decimals, Base EIP-3009 and BNB Permit2 request fields, settlement results, receipts and recovery. Keep facilitator keys on your server.
- x-pay-sdk — JavaScript merchant SDK with setup instructions and tests. The repository update supports current dashboard merchant keys; see its README for installation and the older npm release limitations. Facilitator integration uses the separate guide above.
- x402scan — Our fork of Merit Systems’ explorer for ecosystem contributions.
- x402facilitators — Our fork of the community facilitator directory.
X Pay is approved for Base and BNB mainnet directory inclusion by X402blockchains. This is a directory listing, not a security audit or certification of payment volume.
Other applications remain open as of 11 October 2026; they are not approvals:
| Directory | Application status |
|---|---|
| x402scan | Open pull request #1218 |
| x402 protocol ecosystem | Open pull request #3746 |
| Awesome Agentic Commerce | Open pull request #783 |
| Community facilitator directory | Open pull request #20 |