Market Context
Stablecoin market cap $287.3B 24h stablecoin volume $68.5B
Volume / market cap 23.9%
BTC $62,911 -1.98%
ETH $1,704 -1.63%
Updated Jun 18, 2026 20:04 UTC
StableCoin.com Directory

x402 Ecosystem Directory

A reference index for the emerging x402 payment ecosystem: protocol resources, facilitators, services, developer tooling, marketplaces, and StableCoin.com pages that explain the surrounding payment workflows.

Directory Map

How to read the ecosystem

The x402 market has several layers. A complete workflow can involve a seller, a buyer, a wallet, a supported asset, a network, a facilitator, and a paid resource.

  • Protocol and docs The common HTTP 402 payment pattern and implementation guidance.
  • Facilitators Infrastructure that helps verify and settle payment payloads.
  • Services and endpoints APIs, data, content, AI tools, and utilities that can charge per request.
  • Developer tools SDKs, examples, gateways, proxies, playgrounds, and validators.
  • Wallet and account infrastructure Wallets and embedded accounts that can sign and send supported payments.
Comparison Fields

What should eventually be compared

A useful micropayment directory should help buyers and builders compare operational details, not just logos.

  • Asset and network Which stablecoin, token standard, chain, and testnet/mainnet environment are supported.
  • Pricing model Per request, per token, per dataset row, per compute job, fixed fee, subscription hybrid, or free test mode.
  • Agent readiness Whether the service can be used by automated clients without manual signup or dashboard steps.
  • Docs and examples Whether the service publishes clear integration docs, sample code, and error-handling guidance.
  • Operational signals Status, uptime, support path, refund rules, limits, and known settlement dependencies.
x402 ecosystem comparison. Information is based on public listings and official links; verify details before integration.
Project Category Role Assets Networks Agent Human Notes
x402.org Protocol / ecosystem Official ecosystem reference Protocol-specific; see docs Varies by scheme and facilitator Yes Reference Official ecosystem page for foundation members, integrations, services, facilitators, and implementation paths.
x402 Docs Documentation Protocol implementation docs Protocol-specific; see docs Varies by implementation Yes Reference Documentation for buyers, sellers, HTTP 402 concepts, facilitators, and implementation flows.
x402.org Facilitator Facilitator Testnet facilitator reference EIP-3009, SPL listed by x402 Base Sepolia, Solana devnet listed by x402 Yes No Listed by x402 as the default testnet facilitator.
x402.rs Facilitator Facilitator Open-source facilitator EIP-3009, SPL listed by x402 Base, Solana, Avalanche, Polygon, Sei, XDC listed by x402 Yes No Independent Rust facilitator listed in the x402 ecosystem.
xpay Facilitator Facilitator Hosted facilitator USDC / EIP-3009 listed by x402 Base, Base Sepolia listed by x402 Yes No Serverless facilitator listing focused on EIP-3009 USDC verification and settlement.
thirdweb Developer tools / facilitator Client SDK and facilitator API Multiple tokens listed by thirdweb/x402 Multi-chain support listed by thirdweb Yes Developer Client-side tools and server-side facilitator infrastructure for x402-compatible endpoints.
x402engine Services / endpoints Pay-per-call API collection USDC and USDm listed by x402 Base, Solana, MegaETH listed by x402 Yes Developer Listed as pay-per-call APIs for AI agents, inference, code execution, analytics, storage, and search.
WalletIQ Services / endpoints Wallet intelligence API USDC listed by x402 Base listed by x402 Yes Developer Listed as a per-lookup wallet profile API.
twit.sh Services / endpoints Data API USDC listed by x402 Base listed by x402 Yes Developer Listed as real-time Twitter/X data for AI agents with pay-per-request access.
Zyte API Services / endpoints Web data API See official docs See official docs Yes Developer Listed by x402 with documentation for x402 usage.
x402scan Explorer / analytics Ecosystem explorer Not applicable Not applicable Reference Yes Listed as an ecosystem explorer for x402 resources and analytics.
x402 Playground Developer tools Testing environment See official docs See official docs Developer Yes Interactive testing environment for x402-enabled endpoints and payment flows.
tollbooth Developer tools API gateway See official docs See official docs Yes Developer Open-source gateway for turning APIs into paid x402 APIs.
x402-proxy Client integration CLI / proxy USDC listed by x402 Base and Solana listed by x402 Yes Developer Listed as a CLI/library that can auto-pay HTTP 402 responses.
Subnano Content / client integration Micropayment content platform Nano listed by x402 See official docs No Yes Content-oriented listing where readers pay for what they read.
x402wall Content / example Paid page concept USDC listed by x402 See official docs No Yes Human-facing paid slot/page example listed in the x402 ecosystem.
CDP Facilitator Facilitator Coinbase developer facilitator docs See official docs See official docs Yes Developer Coinbase Developer Platform facilitator reference listed by x402.
Pay.sh Facilitator Hosted facilitator / payment infrastructure See official docs See official docs Yes Developer Facilitator listing in the x402 ecosystem.
OpenFacilitator Facilitator Open facilitator infrastructure See official docs See official docs Yes Developer Facilitator listing in the x402 ecosystem.
Polygon Facilitator Facilitator Polygon payment-services x402 docs See official docs Polygon context Yes Developer Polygon x402 facilitator documentation listed by x402.
Built on Stellar Facilitator Stellar x402 application guide See official docs Stellar context Yes Developer Stellar developer documentation listed in the x402 ecosystem.
Bitrefill Facilitator Facilitator Commerce-oriented facilitator listing See official docs See official docs Yes Developer Bitrefill facilitator listing in the x402 ecosystem.
Cloudflare Infrastructure & tooling Edge / web infrastructure integration See official docs See official docs Developer Developer Cloudflare x402 infrastructure reference listed by x402.
AWS Infrastructure & tooling CloudFront / Lambda@Edge implementation reference See official docs See official docs Developer Developer AWS builder content listed by x402 for monetizing HTTP applications.
Alchemy Infrastructure & tooling Agent infrastructure See official docs See official docs Yes Developer Alchemy agent infrastructure listing in the x402 ecosystem.
Browserbase Infrastructure & tooling Browser automation infrastructure See official docs See official docs Yes Developer Browser automation infrastructure listing in the x402 ecosystem.
Agentic.Market Marketplace / discovery Agentic service marketplace See official docs See official docs Yes Yes Marketplace/discovery listing for agentic services.
ampersend Marketplace / services Service discovery See official docs See official docs Yes Yes Discovery-oriented service listing in the x402 ecosystem.
x402list.fun Directory / analytics x402 services directory See official docs See official docs Reference Yes Directory and analysis listing for x402 services.
x402station Analytics / monitoring x402 analytics platform Not applicable Not applicable Reference Yes Analytics and monitoring platform listed by x402.
zauth Trust / monitoring Trust infrastructure for autonomous commerce See official docs See official docs Yes Developer Trust, verification, monitoring, refund, and SDK infrastructure listed by x402.
ZeroPay Payment gateway Crypto payment gateway See official docs See official docs Yes Yes Payment gateway listing for human and AI-agent payment flows.
OpenPayment Client integration Payment link / client flow See official docs See official docs Developer Yes Client-side payment integration listing in the x402 ecosystem.
AgentCash Client integration Agent wallet / payment interface See official docs See official docs Yes Developer Client-side integration listing for agent payment flows.
Exa Services / endpoints Search / data service See official docs See official docs Yes Developer Search/data service listing in the x402 ecosystem.
Firecrawl Services / endpoints Web data / crawling service See official docs See official docs Yes Developer Web data service listing in the x402 ecosystem.
Pinata Services / endpoints Storage / content infrastructure See official docs See official docs Yes Developer x402 endpoint listing connected to Pinata infrastructure.
Messari Infrastructure & tooling Crypto market data / research infrastructure See official docs See official docs Developer Developer Messari x402 listing in the ecosystem.
Nansen Infrastructure & tooling Blockchain analytics / data infrastructure See official docs See official docs Developer Developer Nansen x402 payment documentation listed by x402.
QuickNode Services / endpoints Blockchain infrastructure examples See official docs See official docs Developer Developer QuickNode labs x402 rails repository listed in the x402 ecosystem.
Bitrefill Services / endpoints Commerce service See official docs See official docs Developer Yes Commerce-oriented service listing in the x402 ecosystem.
AgentMail Client integration Email / agent integration See official docs See official docs Yes Developer AgentMail x402 integration documentation listed in the ecosystem.
x402 Market Marketplace / infrastructure Launchpad for x402-enabled services See official docs See official docs Yes Yes Marketplace/launchpad listing for x402-enabled services.
Vercel Infrastructure & tooling Serverless / MCP payment integration See official docs See official docs Yes Developer Vercel x402/MCP payment integration reference listed by x402.

Ecosystem Categories

  • Official x402 ecosystem
    Official ecosystem reference
    x402.org publishes foundation members, featured integrations, implementation paths, services, facilitators, and ecosystem projects.
    Official site
  • x402 documentation
    Official documentation
    Protocol documentation for implementing x402 buyers, sellers, and payment flows.
    Official site
  • x402 whitepaper
    Official reference
    Whitepaper reference for protocol background and payment-flow design.
    Official site
  • Facilitators
    Settlement infrastructure
    Payment verification and settlement services used by x402-enabled applications.
  • Services and Endpoints
    Pay-per-use resources
    Paid API, data, AI, content, and utility endpoints that can expose x402 payment requirements.
  • Developer Tools
    SDKs and tooling
    Open-source libraries, API gateways, test tools, clients, examples, proxies, and validators.
  • Payment APIs Directory
    StableCoin.com company directory
    Stablecoin payment platforms and developer APIs that overlap with micropayment and x402 workflows.
  • Wallets Directory
    StableCoin.com company directory
    Wallets and embedded account infrastructure that can support stablecoin payment flows.

x402 Directory Standards

These pages are neutral ecosystem references. Inclusion does not imply endorsement, partnership, acquisition interest, or commercial relationship.

StableCoin.com does not operate an x402 service, process payments, custody funds, or verify uptime. Entries should be checked against official docs before integration.