stealthstack.ai Status Publish a catalog

Agent payments

Payment rails built for agents.

They cover x402 facilitators, agent wallets, spend limits, pay-per-call API marketplaces and agent commerce protocols.

A tool that only charges through x402 is filed under what it does, not here.

Listings are what publishers declare in their ARD catalogs and the registries StealthStack reads. The category and summaries are our reading of each listing. Each listing links to its own page with the publisher's endpoint.

All types MCP serversSkillsA2A agentsAPIs
x402 facilitatorsAgent walletsSpend controlsPaid API marketplacesAgent commerce protocols
  1. APINeuronto Payments: x402 facilitator API x402 facilitator that verifies and settles USDC payments on-chain; no account.
  2. MCP SERVERMandateShield AI Payment Authority MCP Server Checks agent purchases against spend policy and reserves signed authority; no execution.
  3. MCP SERVERAFOS Agent Gateway Gateway to Focxle agent payment and workforce infra; USDC on Base via x402, no account.
  4. APIMandateShield Payment Authority API Binds signed agent purchase approvals to provider requests via permits and receipts.
  5. A2A AGENTHilt Pay Agent Gateway Hilt Pay: x402 paid requests in Solana USDC, metered usage, receipts and entitlements.
  6. A2A AGENTMEO Preflight A2A Agent A2A agent that checks a machine service's payment terms against observed history.
  7. APIMEO Preflight HTTP API API that checks a machine service's payment terms against observed history before paying.
  8. A2A AGENTMandateShield Payment Authority A2A Agent A2A agent for payment-policy analysis and signed-authority verification; no execution.
  9. MCP SERVERAgent Guild x402 Payment Safety Issues signed allow/block decisions before an x402 payment is signed.
  10. MCP SERVERMEO Preflight MCP Checks a machine service's payment destination and price against observed history.
  11. A2A AGENTP0 Agent Economy Index Ranked index of paid x402 services by calls, paying wallets and prices.
  12. MCP SERVERAgentgates MCP server Pairs an Agentgates wallet over MCP (OAuth) to act under owner-approved grants.
  13. API2s Pay-per-call x402 gateway to 300+ data endpoints; USDC on Base/Solana, no keys.
  14. MCP SERVERVaaya MCP server Pay-per-call access to many paid agent capabilities; OAuth 2.1, billed on success.
  15. APIDelx Commerce OpenAPI x402 (986 products) OpenAPI catalog of 987 paid x402 routes for agents, settled in USDC on Base.
  16. A2A AGENTSCVD Evidence Agent — A2A agent card A2A agent for x402 endpoint preflight, receipt verification and readiness; free.
  17. APISCVD General Store — HTTP API OpenAPI for SCVD free x402 checks plus paid operations settled via x402.
  18. MCP SERVERSCVD General Store — MCP server SCVD store MCP: free x402 checks and paid buy tools settled via x402.
  19. MCP SERVERSCVD x402 Verifier — MCP server Free MCP for x402 endpoint preflight and receipt verification, no paid tools.
  20. API2s.io — pay-per-call APIs for AI agents 575 pay-per-call data endpoints across 112 domains; x402 USDC, no signup or key.
  21. APIAgent access Buy Brandfetch API access without an account via x402 or MPP payment.
  22. MCP SERVERAusca MCP server card Ausca MCP for metered keyless services: OCR, browser sessions, temporary inboxes.
  23. APIDelx paid OpenAPI x402 (986 products) OpenAPI 3.1 for 987 paid x402 micro-result endpoints in USDC on Base or Solana.
  24. MCP SERVER2s.io MCP server MCP server exposing 575 pay-per-call 2s.io data tools; x402, free trial call per hour.
  25. MCP SERVERBounty Engineer Agent Commerce MCP Agent commerce, routing, budget and verification tools with x402 purchase paths.
  26. CATALOGDelx Commerce catalog (nested) Nested ARD catalog for Delx's pay-per-result storefront of 500 x402 products.
  27. SKILLAusca agent skill Skill to discover and invoke Ausca metered agent services via HTTP, x402 and MCP.
  28. APIDelx paid OpenAPI x402 OpenAPI for 500 paid x402 micro-result endpoints, paid in USDC on Base.
  29. A2A AGENTBounty Engineer A2A Agent A2A buyer assistant that picks paid tools and returns x402 purchase instructions.
  30. APIVaaya HTTP API OpenAPI for Vaaya signup, balance and pay-per-call service dispatch.
  31. A2A AGENTDelx Commerce A2A agent A2A agent card for Delx Commerce's x402 machine storefront and product discovery.
  32. A2A AGENTXGuard — Agent Execution Gateway Gateway that turns APIs into paid agent APIs with pricing, metering and receipts.
  33. SKILLSCVD General Store — the store skill Skill explaining the SCVD store x402 purchase flow and retry-safety rules.
  34. MCP SERVERDelx Commerce MCP discovery MCP server card for Delx Commerce pay-per-result API discovery.
  35. MCP SERVERForceDream MCP Server MCP tools to discover, price, invoke and verify proofs for ForceDream agents.
  36. A2A AGENTGrowaify Agent commerce: discover services, get binding quotes, order and pay via PayPal or x402.
  37. A2A AGENTAPIMesh Pay-per-call marketplace of four web-analysis, SEO, security and devops APIs.
  38. APIBerrerGate Agent Utility Pilot x402 utility pilot: pay-per-call short AI inference and a read-only goods catalog route.
  39. A2A AGENTMacaroon Network Marketplace of agent-purchasable capabilities that settle only when a predicate passes.
  40. MCP SERVERVaaya Paid APIs and tokenized shares for agents with prepaid funding.
  41. MCP SERVERagentery Pricing data for commercial AI agents and MCP servers with a price index.
  42. API2s.io Batch Runs up to 50 2s.io endpoint calls behind one x402 payment.

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