gold-402
July 7, 2026 · View on GitHub
The gold standard for x402 resources. Facilitators, SDKs, APIs, MCP servers, tools, and ecosystem data — curated by 24K Labs. No filler. No dead links. Updated monthly.
The x402 ecosystem passed 50M transactions in March 2026. 300+ projects across 8 chains. 10,000%+ year-over-year growth. The community awesome-list accepts everything — that's its job.
gold-402 doesn't. Every entry in the README earned its place. The full catalog lives in directory/.
This is the editorial layer: curated picks with context and badges, backed by an exhaustive reference directory. Two layers, one repo.
Featured This Month
★ July 2026 — 24K Labs Verification Report: Three-Quarters of the x402 Bazaar Is Dead by 24K Labs
We probed all 22,545 x402 services in the CDP Bazaar. 5,792 returned a valid 402 Payment Required response. The other 16,753 were gone, misconfigured, or unreachable — a 74% dead rate.
That number is the whole argument for a verified catalog. The Bazaar reflects everything ever listed; it cannot tell you what is running right now. This report can: the headline finding, a reproducible methodology, and the verified services framed as "the ones that actually work" — including real payer counts that no listing can fake. It is the most direct statement of what gold-402 is for.
Read the full report → · Past features →
What's New
July 2026 — 22,545 x402 endpoints probed. 74% are dead. Here's what's actually live.
- 24K Labs Verification Report — We probed every x402 service in the CDP Bazaar. 5,792 verified live (25.7%). 16,686 failed (74%). The verified catalog is what makes the Bazaar usable. → Full report
June 2026 — Enterprise infrastructure arrives: Fireblocks, Arbitrum, and 169M+ transactions.
- Fireblocks Agentic Payments Suite — Full-lifecycle agentic payment infrastructure from the $14T digital asset custody platform. MPC agentic wallets with delegation rules, merchant Gateway for stablecoin acceptance, and a security extension to the x402 spec (request integrity + spend governance). Joined the x402 Foundation May 20, 2026. ★ June Featured Pick →
- x402 live on Arbitrum — Arbitrum confirmed x402 deployment on May 15. x402 now runs natively on Base, Ethereum, Arbitrum, Polygon, and Solana. EVM coverage is effectively complete.
- 169M+ transactions, 590k+ buyers, 100k+ sellers — Updated ecosystem stats from Coinbase's AWS Bedrock launch post. Grew from 50M to 169M transactions in roughly six weeks post-Foundation launch.
- AWS Bedrock AgentCore Payments — now production — AWS-managed x402 wallet and payment infrastructure natively integrated into Amazon Bedrock agent workflows. Moved from preview to production.
- LayerZero joins x402 Foundation — Cross-chain infrastructure added to the Foundation roster. Enables x402 payments to bridge across chains without manual routing at the application layer.
- Quant Network joins x402 Foundation — Interoperability and programmable-money infrastructure joins Foundation governance. Expands the enterprise interoperability story for regulated deployments.
Contents
- Featured This Month
- What's New
- Quick Start
- How x402 Works
- Facilitators
- SDKs & Libraries
- MCP Servers
- APIs & Services
- Tools & Monitoring
- Security & Compliance
- Ecosystem & Wallets
- Learning & Community
- Market Data
- Need More?
- Contributing
Quick Start
New to x402? Three steps to your first payment.
1. Pick a facilitator
| Use case | Facilitator |
|---|---|
| Most chains, full SDK support | Coinbase CDP |
| Edge deployment, global latency | Cloudflare x402 |
| Enterprise billing + disputes | Stripe Machine Payments |
2. Install the SDK
# TypeScript
npm install @coinbase/x402-express
# Python
pip install x402
# Rust
cargo add x402
3. Add payment middleware
import { paymentMiddleware } from '@coinbase/x402-express';
app.use(paymentMiddleware(wallet, {
'/api/data': { price: '\$0.01', network: 'base-mainnet' }
}));
That's it. The middleware returns 402 with payment details, verifies the client's payment header, and lets the request through.
Full quickstart → · Testnet setup →
How x402 Works
1. Client → GET /api/data (initial request)
2. Server ← 402 Payment Required (payment details in header)
X-Payment-Required: {amount, address, network}
3. Client → EIP-3009 gasless USDC transfer (client signs + submits)
4. Client → GET /api/data + X-Payment: {signed tx} (retry with payment)
5. Facilitator → verify + settle on-chain (~2 seconds)
6. Server ← 200 OK + X-Payment-Response (resource returned)
No gas for the sender. No subscription. No API key. Payment IS authentication.
Facilitators
Facilitators verify payment headers and settle transactions on-chain. Production deployments require one. Choose based on chains needed and where you're deploying.
| Facilitator | Chains | Description |
|---|---|---|
Coinbase CDP  | Base, ETH, SOL, POL, XRPL, XLM, + | Official facilitator. Most chains, deepest SDK integration. Primary choice for production. |
| Cloudflare x402 | Base, ETH | Edge-native. Zero cold start, global CDN distribution. Best for latency-sensitive APIs. |
Stripe Machine Payments  | Base | Enterprise billing infrastructure: dispute resolution, fraud detection, compliance tooling. |
| Polygon x402 | Polygon | Now leading Base in daily transaction count. MATIC fee subsidies for agentic payments. |
| Stellar x402 | XLM | Fastest finality in the ecosystem. Added March 2026. |
AsterPay   | Base, ETH | EU/MiCA-compliant facilitator for European enterprise deployments. |
Dexter DAO   | Base, ETH, SOL, + | Largest x402 facilitator by volume. Handles ~50% of daily transactions. Chain-agnostic v2 SDK with client, server, React hooks, and Express middleware. |
Ultravioleta DAO  | EVM, SOL, NEAR, XLM, ALGO, SUI, + | Broadest multi-chain coverage in the ecosystem. 33+ networks including non-EVM chains. REST API with chain-specific settlement routing. |
SDKs & Libraries
| SDK | Language | Description |
|---|---|---|
| x402-typescript | TypeScript | Official SDK. Express, Hono, Next.js, Fastify middleware + x402-fetch client. The default choice. |
| x402 Python | Python | Official SDK. FastAPI middleware + async requests client. |
| x402-rs | Rust | Axum middleware + async runtime. Full EIP-3009 signing. |
| ag402 | Go/Python | Multi-language. Wrap any API with ag402 serve, auto-pay with ag402 run. Solana USDC. |
| x402-mcp | TypeScript | Vercel AI SDK paidTool primitive. The cleanest path for AI SDK builders. |
MoltsPay  | TypeScript | Multi-framework (Express, Hono, Fastify, Next.js). Base + Solana + ETH. Drop-in replacement. |
| Mogami | Java | Production-ready Java x402 stack with SDK, server, console, and bundled MCP server. Fills the Java gap in the official ecosystem. |
| Solana Foundation Pay | TypeScript | Official Solana Foundation library for handling x402 and MPP payment challenges with user-authorized stablecoin signing. Updated May 2026. |
Full SDK directory → · Framework middleware →
MCP Servers
x402-native Model Context Protocol servers — AI agents pay per tool call, no API keys.
| MCP Server | Category | Description |
|---|---|---|
agentsvc.io MCP  | General | 100+ curated MCP tools, x402-gated. The hub for AI agent tooling. |
| x402-mcp | SDK | Vercel AI SDK paidTool primitive — for building MCP tools that monetize via x402. |
| IteraTools MCP | Automation | Task automation via x402. Sequential and parallel workflow execution. |
| EntRoute MCP | Data/Intelligence | Data intelligence and routing. Multi-chain analytics. |
| ShieldAPI MCP | Security | 9 endpoints: breach check (900M+ HIBP hashes), URL safety, prompt injection detection. |
| MoltGuard | Trust | Agent trust scoring (0-100), Sybil detection, Ed25519 Verifiable Credentials. 7 MCP tools. |
| ToolOracle | Discovery | Real-time discovery of x402-enabled tools across the ecosystem. Agents find tools, tools get paid. |
| 24K Labs Code Review MCP | Dev Tools | AI code review + security audit via MCP. Pay per PR. Runs in CI or interactively. |
APIs & Services
x402-payable APIs — pay per request, no subscriptions.
| Service | Pricing | Description |
|---|---|---|
| 24K Labs Code Review API | $0.01-$3.00 | 6 AI code services: explain, debug, review, security audit, automation, MCP blueprint. USDC on Base. |
| agentsvc.io | Per-call | 100+ AI tools via a single x402-gated endpoint. One integration, full ecosystem access. |
| Strale | Per-token | LLM inference via x402. Pay per token, no subscription, no API key. |
| AIsa | Per-call | AI + crypto data fusion. Highest x402 transaction count of any API service in the ecosystem. |
QuickNode RPC  | Per-request | Pay-per-request RPC access to 130+ chains. No node management. |
| Arch Tools | Per-call | 27 on-chain tools. Portfolio analysis, NFT data, market intelligence on Base. |
| ShieldAPI | $0.002–$0.05 | Security intelligence: breach check, domain reputation, URL safety, prompt injection detection. |
| Valoria | — | Market intelligence: 90K+ indexed services, $148M+ tracked on-chain volume, revenue rankings. |
| Firecrawl x402 | Per-request | Web scraping and search API with x402-gated endpoints and automatic on-chain USDC settlement. Coinbase CDP case study service. |
| JMT x402 Agent Tools | $0.001-$0.15 | 25 endpoints: web search, AI analysis, crypto/stock data, SEC filings, company intel, news, sentiment, macro dashboard. USDC on Base. Local LLM-powered. |
Tools & Monitoring
| Tool | Description |
|---|---|
| x402-proxy | npx x402-proxy — cURL for x402 APIs. Auto-pays 402 with USDC on Base and Solana. MCP stdio proxy. |
| Paybound | Open-source governance proxy. Per-agent budgets, circuit breakers, SQLite audit trail. Drop-in @x402/fetch replacement. |
| Sentinel/Valeo | Enterprise audit layer. Budget enforcement, structured trails, real-time dashboard, public payment explorer. |
| ScoutScore | Trust scoring for x402 services. Monitors 1,700+ services with continuous health checks. |
| x402scan | Block explorer for x402 payments. Transaction search, payment requirement inspection, settlement status. |
| 24K Labs GitHub Action | AI code review + security audit on every PR via x402 micropayments. Drop into any GitHub Actions workflow. |
| Agent Forensics | Claude Code cost observability. Analyzes JSONL session logs: per-model cost breakdown, cache efficiency, waste patterns. Free CLI. |
| x402station | Real-time monitoring and discovery for 20,000+ x402 endpoints. Continuous health probes every 10 minutes. MCP server for agent access included. |
| AWS CloudFront x402 sample | AWS-published reference implementation for monetizing content behind CloudFront and WAF with x402 and USDC payments. |
| LemonCake | x402 gateway + agent funding rail. 402 challenge returns accepts[] with buyUrl (human) and mintUrl (machine). Off-session top-ups via Buyer Key (hard-capped per-mint/daily/monthly). Stripe Connect Direct Charge — custody-free. MCP server on npm. |
Security & Compliance
| Service | Description |
|---|---|
| ShieldAPI | x402-native security API. Breach check (900M+ HIBP hashes), domain/IP reputation, prompt injection detection. |
| KaelAi | Wallet trust scoring 0-100 across 10 chains. Vet incoming/outgoing payment wallets before serving requests. |
| MoltGuard | Agent trust scoring, Sybil detection with funding cluster analysis, Ed25519 Verifiable Credentials. |
| Paybound | Governance proxy with circuit breakers and per-agent spending limits. MIT licensed. |
| SENTINEL | AML/CFT compliance. 77K+ sanctions entities (OFAC, UN, EU, PEP, Interpol), 159-country jurisdiction risk scoring. |
| PolicyLayer | Non-custodial spending controls. Daily limits, per-transaction caps, recipient whitelists — no private key custody. |
Ecosystem & Wallets
| Project | Description |
|---|---|
| Coinbase Agentic Wallets | Native CDP wallets purpose-built for AI agents. Launched April 2, 2026. The reference implementation. |
| Cloudflare Agents SDK | Edge-native agent deployment with x402 built in. v0.4.0 adds x402 v2 migration (March 2026). |
| Agent.market | Official app store for AI agents. x402-powered transactions. Launched April 20, 2026. |
| WorkProtocol | Structured work marketplace for agents and builders. Escrow-backed jobs, on-chain reputation. |
| Nevermined + Visa | AI agents get delegated credit card spending authority via Visa Intelligent Commerce + x402 (April 2026). |
| World AgentKit | WorldID biometric identity + x402. Prove a verified human is behind every agent transaction. 18M+ verified humans. |
Learning & Community
Get Started
- 5-Minute Quickstart
- x402 Protocol Spec — Official open-source protocol by Coinbase.
- Coinbase Developer Platform Docs — Complete implementation guide and API reference.
- LearnAI x402 Course — Free, interactive, AI-guided. Covers the full payment flow, facilitator setup, and agent-to-agent payments.
Essential Reading
- 24K Labs: x402 Explained — History and technical breakdown of HTTP 402.
- AWS: x402 and Agentic Commerce — Full x402 stack with AgentCore + CloudFront + Lambda@Edge.
- WorkOS: x402 vs Stripe MPP — How to choose in 2026.
- CoinDesk: Demand Still Unproven — Honest March 2026 assessment. Worth reading.
Community
- x402 Foundation Discord — Official community. Protocol questions and announcements.
- x402 Builders Telegram — Active developer chat.
- GitHub Issues — coinbase/x402 — Technical Q&A and bug reports.
- Agent Economy Digest — Weekly newsletter covering x402, MPP, A2A, and agentic commerce.
Full learning directory → · Full community directory →
Market Data
April 2026 snapshot.
| Metric | Value |
|---|---|
| Cumulative Transactions | 50M+ |
| Annualized Volume | ~$600M |
| Ecosystem Market Cap | $815M |
| Total Projects | 300+ |
| Supported Chains | 8+ |
| Transaction Growth (YoY) | 10,000%+ |
| Foundation Members | 22+ |
| Settlement Speed | 2 seconds avg |
Chain leaders: Solana commanded up to 88% of transaction count by volume. Polygon now leads Base in daily transaction count. Base leads in cumulative value transferred (~$21.5M).
Full market data → · Live dashboard → · On-chain analytics →
Need More?
The README is the curated magazine — handpicked entries with context and tags. The directory/ folder is the exhaustive reference, with everything we know about across the x402 ecosystem.
- Facilitators — all hosted and self-hosted facilitators, hosted and self-hosted coverage tables.
- SDKs & Libraries — all SDKs by language: TypeScript, Python, Rust, Go, and more.
- Frameworks & Middleware — server middleware for Express, Hono, Next.js, FastAPI, Axum, and Cloudflare Workers.
- MCP Servers — the full MCP ecosystem, organized by category.
- APIs & Services — all x402-payable API services: AI, data, infrastructure, and production deployments.
- Tools & Utilities — CLI tools, monitoring, analytics, spending controls, testing, and discovery.
- Security & Compliance — audits, security tools, spending controls, trust scoring, and compliance.
- Ecosystem & Wallets — agent wallets, frameworks, marketplaces, and infrastructure.
- Learning Resources — quickstarts, tutorials, articles, news, and migration guides.
- Community — channels, newsletters, jobs, and events.
- Market Data — on-chain analytics, dashboards, enterprise adoption, and growth timeline.
Contributing
gold-402 is curated, not exhaustive. Every entry earns its place.
See CONTRIBUTING.md for the curation standard, badge system, acceptance criteria, and submission process.
Quick rules:
- Entry must use the x402 protocol (HTTP 402 + X-Payment), not just USDC or general crypto payments.
- Live URL or public GitHub repo. Link must work.
- Last activity within 12 months, or carries a
24K Verifiedtag. - One entry per pull request. Format:
[Name](url) — Description starting uppercase, ending with period. - Descriptions are factual. No marketing language.
Curated by 24K Labs
If this saved you time, star the repo.
x402.org •
Protocol Spec •
Coinbase Docs •
Discord •
Live Dashboard