Machine-payable APIs
0.5%Pauschal-Gateway-Gebühr
16 Proofsoperational explainers
Kein Sorgerechtdirect multisig & vault routing
Testnetz (Testnet)vor der Mainnet-Überprüfung
Monetize LLM, GPU, and data endpoints per call with sub-millisecond edge cryptography.
XPayr pairs /.well-known/x402.json challenge headers with ES256 JWT access receipts verifiable offline against /.well-known/jwks.json across Cloudflare Workers, FastAPI, Express, and Next.js.
HTTP 402 Paywall Verification lets API providers return a structured 402 Payment Required challenge to unauthenticated clients or autonomous AI agents. Once the non-custodial USDC, USDT, SOL, or NEAR payment confirms, XPayr issues a short-lived ES256-signed JWT that your edge gateway verifies locally using cached public JWKS keys in under 1 millisecond.
01
Client or AI agent calls a protected API endpoint without a valid Bearer receipt and receives HTTP 402 + x402 payment session metadata.
02
Agent or developer completes the 0.5% non-custodial payment (enforced by MCP Ausgaben-Leitplanken if automated).
03
Client exchanges the confirmed session proof for a signed ES256 JWT scoped to the endpoint quota or TTL.
04
API server or Cloudflare Worker verifies the ES256 signature offline against https://xpayr.com/.well-known/jwks.json.
Who pays gas?
HTTP 402 challenges and ES256 JWT verifications are 100% off-chain; network gas applies only when the on-chain payment settles.
Operational limit
API operators remain responsible for caching JWKS keys, enforcing jti/quota counters at their edge, and setting appropriate token TTLs.
FAQ
What problem does this XPayr flow solve?
HTTP 402 Paywall Verification lets API providers return a structured 402 Payment Required challenge to unauthenticated clients or autonomous AI agents. Once the non-custodial USDC, USDT, SOL, or NEAR payment confirms, XPayr issues a short-lived ES256-signed JWT that your edge gateway verifies locally using cached public JWKS keys in under 1 millisecond.
Who pays gas or network fees?
HTTP 402 challenges and ES256 JWT verifications are 100% off-chain; network gas applies only when the on-chain payment settles.
What should merchants not assume?
API operators remain responsible for caching JWKS keys, enforcing jti/quota counters at their edge, and setting appropriate token TTLs.
Verifiable Open-Source & AI Protocol Registry
Publicly auditable SDKs, cryptographic evidence envelopes, and MCP registries.
Offizieller 21-Tool-MCP-Server
Registered as io.github.xpayrcom/xpayr-mcp-server on the Official Anthropic MCP Registry and published as @xpayr/mcp-server on NPM and ghcr.io/xpayrcom/xpayr-mcp-server:latest.
Merkle Payment Evidence & ES256 Tokens
Verify on-chain settlement envelopes with @xpayr/payment-evidence and offline-verifiable ES256 wallet licenses with @xpayr/extension-kit.
30 Open-Source Repositories & RFC 9116
Inspect all 20 REST API v1 schemas interactively at api-docs.xpayr.com, review our 30 repositories at github.com/xpayrcom, and check /.well-known/security.txt & /.well-known/jwks.json.
Müssen Sie den Ablauf vor der Produktion prüfen?
Nutzen Sie Testnet Checkout, API-Dokumente, Webhook-Anleitungen und Betriebserklärungen, bevor Sie eine Mainnet-Aktivierung anfordern.