x402.json Builder.Design production-ready 402 Payment Required machine paywalls in seconds. Configure your protected route, per-call or pass pricing, settlement chain, and monthly request forecast — then copy compliant HTTP headers, /.well-known/x402.json, and offline ES256 middleware.
Merchant 99.5% net monthly settlement directly to your wallet — saving $840.00/mo vs traditional card micropayment fees.
When an unauthenticated client or AI agent calls your protected endpoint, your middleware returns HTTP 402 Payment Required with XPayr challenge headers and a JSON quote. The agent settles the USDC/USDT session via @xpayr/mcp-server (0.5% flat split) and retries with Authorization: X402 <es256_jwt>, which your API verifies in <1ms against /.well-known/jwks.json.
For high-cost endpoints ($0.10–$25.00 per GPU render, deep research report, or dataset export), per-request challenges on Base or Solana (~$0.001–$0.004 gas) work seamlessly. For sub-cent LLM token streaming, mint a 1,000-call ES256 JWT pass ($5–$20) so agents make zero on-chain calls during inference.
Never. XPayr charges zero fixed cent fees ($0.00 + 0.5% flat split) and routes 99.5% of every API payment straight to your self-custodial wallet.
Publish the generated JSON at https://api.yourdomain.com/.well-known/x402.json so MCP clients, Google A2A agents, and x402 crawlers discover your pricing tiers and JWKS verification issuer automatically.
Model your recurring 30% RevShare and CPA earnings across referred merchants and volume.
Fee savingsCompare your current processor cost with XPayr flat 0.5% gateway pricing.
Network choiceChoose the right stablecoin rail across TRON, Ethereum, Solana, Polygon, and BNB Chain.
Launch readinessScore whether your business is ready for links, widgets, API checkout, and mainnet review.
Settlement designModel accepted assets, preferred settlement asset, routing complexity, and operational controls.
Checkout previewWalk through session creation, wallet payment, confirmation, webhook, and reconciliation.
Developer QAGenerate sample payment events, headers, HMAC signatures, and verification snippets locally.
No-code embedCustomize an embeddable multi-chain crypto checkout button with live modal preview and HTML/React snippets.
AI Agent QAExecute live JSON-RPC 2.0 tool calls against https://xpayr.com/api/mcp and inspect all 21 AI agent tools.
Agent guardrailsModel per-tx limits, daily caps, auto-approval thresholds, and chain whitelists for autonomous AI commerce agents.
License Kit QASimulate cryptographic wallet-bound software licenses for extensions, plugins, and SaaS with @xpayr/extension-kit (v0.2.0).
Treasury payoutsModel non-custodial multi-recipient payouts (10 to 5,000 wallets), gas savings, and JSON manifests for XPayr Payout Hub.
Zero chargebacksCalculate annual profit lost to card chargebacks, $15-$25 dispute fees, and rolling reserves vs XPayr 0.5% non-custodial finality.
B2B invoicingBuild itemized B2B USDT/USDC invoices, preview 99.5% direct wallet splits, and copy ready-to-run API v1 & MCP session payloads.
Retail & POSSimulate in-person retail & hospitality counter bills with optional tips, instant QR checkout, and 0.5% split vs card FX fees.
CFO & ERP auditGenerate balanced QuickBooks CSV, Xero CSV, and NetSuite JSON journal entries with 99.5% / 0.5% splits and tx_hash proofs.
Exchange QR QAModel Binance/Bybit/OKX withdrawal fee deductions against XPayr 1% (max $0.50) tolerance and preview underpaid_accepted webhooks.
9-Chain BenchmarkRank Base, Arbitrum, Optimism, Polygon, Solana, BNB Chain, TRON TRC-20, Ethereum, and Circle Arc by gas cost, finality, and 99.5% net take-home.
8-Stack CodegenGenerate zero-placeholder checkout, HMAC-SHA256 webhook, HTTP 402 paywall, and ES256 license snippets across 8 stacks (Node.js, Python, PHP, Go, Rust, Ruby, Next.js, cURL).
On-Chain Split AuditInspect exact token integer base units, Rabby/MetaMask balance simulation deltas, and Transfer event logs vs custodial deposit-sweep gas costs.
SaaS Retention ROIQuantify annual ARR rescued from cross-border card declines, 3.9%+ FX/MoR fees, and subscription disputes by adding XPayr 0.5% USDC/USDT billing.
XPayr · Built on Arc NetworkEstimate an Arc Testnet transaction budget in USDC using the gas inputs you provide. This XPayr tool is a planner, not a Mainnet quote.
XPayr · Built on Arc NetworkPlan a USDC route into or out of Arc Testnet, separate the bridge amount from the XPayr operation fee and continue to wallet-signed execution.
XPayr · Built on Arc NetworkPreview a same-chain stablecoin conversion, slippage budget and XPayr operation fee before requesting an executable quote.
@xpayr/mcp-serverAll form inputs on this tool automatically sync to the page URL query string for one-click team sharing or autonomous AI execution.