https://github.com/Haustorium12/gold-402
⚡ The gold standard for x402 resources. 300+ projects, SDKs, tools, facilitators, and ecosystem data for the HTTP 402 Payment Required protocol. Curated by 24K Labs.
https://github.com/Haustorium12/gold-402
List: gold-402
ai-agents api-monetization awesome-list base blockchain coinbase crypto http-402 mcp micropayments usdc web3 x402
Last synced: 6 days ago
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⚡ The gold standard for x402 resources. 300+ projects, SDKs, tools, facilitators, and ecosystem data for the HTTP 402 Payment Required protocol. Curated by 24K Labs.
- Host: GitHub
- URL: https://github.com/Haustorium12/gold-402
- Owner: Haustorium12
- License: cc0-1.0
- Created: 2026-03-31T19:16:10.000Z (4 months ago)
- Default Branch: main
- Last Pushed: 2026-07-09T05:58:41.000Z (11 days ago)
- Last Synced: 2026-07-09T07:13:35.334Z (11 days ago)
- Topics: ai-agents, api-monetization, awesome-list, base, blockchain, coinbase, crypto, http-402, mcp, micropayments, usdc, web3, x402
- Language: Python
- Homepage: https://www.x402.org/
- Size: 48.7 MB
- Stars: 4
- Watchers: 1
- Forks: 15
- Open Issues: 6
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
Awesome Lists containing this project
- awesome-x402 - gold-402 - Curated x402 directory by 24K Labs. 300+ handpicked entries across facilitators, SDKs, MCP servers, APIs, and tools, with editorial writeups and verified badges for production-confirmed services. (Awesome Lists / Issue Guidelines)
- awesome-agentic-commerce - gold-402 - Curated x402 directory by 24K Labs. 300+ handpicked entries across facilitators, SDKs, MCP servers, APIs, and tools, with editorial writeups and verified badges for production-confirmed services. Backed by a 29,000+ entry full catalog sourced from CDP Bazaar and Agentic.market. (Uncategorized / Uncategorized)
README
# gold-402
> 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.
[](https://github.com/Haustorium12/gold-402)
[](https://github.com/Haustorium12/gold-402/commits/main)
[](https://x402.org/ecosystem)
[](https://24klabs.ai)
[](directory/facilitators.md)
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/`](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**](articles/2026-07-verification-findings.md) by [24K Labs](https://24klabs.ai)
[](FEATURED.md)
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 →](articles/2026-07-verification-findings.md) · [Past features →](FEATURED.md)
---
## What's New
> **July 2026** — 22,545 x402 endpoints probed. 74% are dead. Here's what's actually live.
- [**24K Labs Verification Report**](articles/2026-07-verification-findings.md) — 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](articles/2026-07-verification-findings.md)
---
> **June 2026** — Enterprise infrastructure arrives: Fireblocks, Arbitrum, and 169M+ transactions.
- [**Fireblocks Agentic Payments Suite**](https://www.fireblocks.com/products/agentic-payments) — 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 →](articles/2026-06-fireblocks-agentic-payments.md)
- [**x402 live on Arbitrum**](https://blog.arbitrum.foundation/x402-payments-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**](https://www.coinbase.com/blog/introducing-amazon-bedrock-agentcore-payments-powered-by-x402-and-coinbase) — 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**](https://www.coinbase.com/blog/introducing-amazon-bedrock-agentcore-payments-powered-by-x402-and-coinbase) — AWS-managed x402 wallet and payment infrastructure natively integrated into Amazon Bedrock agent workflows. Moved from preview to production.
- [**LayerZero joins x402 Foundation**](https://x402.org/ecosystem) — 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**](https://x402.org/ecosystem) — Interoperability and programmable-money infrastructure joins Foundation governance. Expands the enterprise interoperability story for regulated deployments.
---
## Contents
- [Featured This Month](#featured-this-month)
- [What's New](#whats-new)
- [Quick Start](#quick-start)
- [How x402 Works](#how-x402-works)
- [Facilitators](#facilitators)
- [SDKs & Libraries](#sdks--libraries)
- [MCP Servers](#mcp-servers)
- [APIs & Services](#apis--services)
- [Tools & Monitoring](#tools--monitoring)
- [Security & Compliance](#security--compliance)
- [Ecosystem & Wallets](#ecosystem--wallets)
- [Learning & Community](#learning--community)
- [Market Data](#market-data)
- [Need More?](#need-more)
- [Contributing](#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](https://docs.cdp.coinbase.com/x402) |
| Edge deployment, global latency | [Cloudflare x402](https://developers.cloudflare.com/workers/examples/x402) |
| Enterprise billing + disputes | [Stripe Machine Payments](https://docs.stripe.com/payments/machine/x402) |
**2. Install the SDK**
```bash
# TypeScript
npm install @coinbase/x402-express
# Python
pip install x402
# Rust
cargo add x402
```
**3. Add payment middleware**
```typescript
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 →](https://docs.cdp.coinbase.com/x402/quickstart-for-sellers) · [Testnet setup →](https://docs.cdp.coinbase.com/x402/network-support)
---
## 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.
[Protocol spec →](https://github.com/coinbase/x402) · [EIP-3009 →](https://eips.ethereum.org/EIPS/eip-3009)
---
## 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](https://docs.cdp.coinbase.com/x402/facilitators) [](CONTRIBUTING.md#24k-verified-tier) | Base, ETH, SOL, POL, XRPL, XLM, + | Official facilitator. Most chains, deepest SDK integration. Primary choice for production. |
| [Cloudflare x402](https://developers.cloudflare.com/workers/examples/x402) [](CONTRIBUTING.md#24k-verified-tier) | Base, ETH | Edge-native. Zero cold start, global CDN distribution. Best for latency-sensitive APIs. |
| [Stripe Machine Payments](https://docs.stripe.com/payments/machine/x402) [](CONTRIBUTING.md#24k-verified-tier) [](FEATURED.md) | Base | Enterprise billing infrastructure: dispute resolution, fraud detection, compliance tooling. |
| [Polygon x402](https://polygon.technology/payments/agentic-payments) [](CONTRIBUTING.md#24k-verified-tier) | Polygon | Now leading Base in daily transaction count. MATIC fee subsidies for agentic payments. |
| [Stellar x402](https://docs.stellar.org/x402) [](CONTRIBUTING.md#24k-verified-tier) | XLM | Fastest finality in the ecosystem. Added March 2026. |
| [AsterPay](https://asterpay.io) [](https://asterpay.io) [](https://asterpay.io) | Base, ETH | EU/MiCA-compliant facilitator for European enterprise deployments. |
| [Dexter DAO](https://github.com/Dexter-DAO/dexter-x402-sdk) [](CONTRIBUTING.md#24k-verified-tier) [](https://github.com/Dexter-DAO/dexter-x402-sdk) | 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](https://facilitator.ultravioletadao.xyz) [](https://facilitator.ultravioletadao.xyz) | 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. |
[Full facilitator directory →](directory/facilitators.md)
---
## SDKs & Libraries
| SDK | Language | Description |
|-----|----------|-------------|
| [x402-typescript](https://github.com/coinbase/x402/tree/main/typescript) [](CONTRIBUTING.md#24k-verified-tier) | TypeScript | Official SDK. Express, Hono, Next.js, Fastify middleware + `x402-fetch` client. The default choice. |
| [x402 Python](https://pypi.org/project/x402/) [](CONTRIBUTING.md#24k-verified-tier) | Python | Official SDK. FastAPI middleware + async requests client. |
| [x402-rs](https://github.com/x402-rs/x402-rs) [](CONTRIBUTING.md#24k-verified-tier) [](https://github.com/x402-rs/x402-rs) | Rust | Axum middleware + async runtime. Full EIP-3009 signing. |
| [ag402](https://github.com/AetherCore-Dev/ag402) [](CONTRIBUTING.md#24k-verified-tier) [](https://github.com/AetherCore-Dev/ag402) | Go/Python | Multi-language. Wrap any API with `ag402 serve`, auto-pay with `ag402 run`. Solana USDC. |
| [x402-mcp](https://vercel.com/blog/introducing-x402-mcp-open-protocol-payments-for-mcp-tools) [](CONTRIBUTING.md#24k-verified-tier) | TypeScript | Vercel AI SDK `paidTool` primitive. The cleanest path for AI SDK builders. |
| [MoltsPay](https://github.com/moltspay/molts-pay) [](https://github.com/moltspay/molts-pay) [](https://github.com/moltspay/molts-pay) | TypeScript | Multi-framework (Express, Hono, Fastify, Next.js). Base + Solana + ETH. Drop-in replacement. |
| [Mogami](https://mogami.tech) [](https://github.com/mogami-tech/x402-mcp-server) | 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](https://github.com/solana-foundation/pay) [](https://github.com/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 →](directory/sdks.md) · [Framework middleware →](directory/frameworks.md)
---
## MCP Servers
x402-native Model Context Protocol servers — AI agents pay per tool call, no API keys.
| MCP Server | Category | Description |
|-----------|----------|-------------|
| [agentsvc.io MCP](https://agentsvc.io/mcp) [](CONTRIBUTING.md#24k-verified-tier) [](https://agentsvc.io) | General | 100+ curated MCP tools, x402-gated. The hub for AI agent tooling. |
| [x402-mcp](https://vercel.com/blog/introducing-x402-mcp-open-protocol-payments-for-mcp-tools) [](CONTRIBUTING.md#24k-verified-tier) | SDK | Vercel AI SDK `paidTool` primitive — for building MCP tools that monetize via x402. |
| [IteraTools MCP](https://iteratools.ai/mcp) [](CONTRIBUTING.md#24k-verified-tier) | Automation | Task automation via x402. Sequential and parallel workflow execution. |
| [EntRoute MCP](https://entroute.ai/mcp) [](CONTRIBUTING.md#24k-verified-tier) | Data/Intelligence | Data intelligence and routing. Multi-chain analytics. |
| [ShieldAPI MCP](https://www.npmjs.com/package/shieldapi-mcp) [](CONTRIBUTING.md#24k-verified-tier) [](https://github.com/alberthild/shieldapi-mcp) | Security | 9 endpoints: breach check (900M+ HIBP hashes), URL safety, prompt injection detection. |
| [MoltGuard](https://api.moltrust.ch/guard/) [](https://github.com/moltrust/moltguard) [](https://api.moltrust.ch) | Trust | Agent trust scoring (0-100), Sybil detection, Ed25519 Verifiable Credentials. 7 MCP tools. |
| [ToolOracle](https://tooloracle.ai) [](https://tooloracle.ai) | Discovery | Real-time discovery of x402-enabled tools across the ecosystem. Agents find tools, tools get paid. |
| [24K Labs Code Review MCP](https://24klabs.ai/mcp) [](CONTRIBUTING.md#24k-verified-tier) | Dev Tools | AI code review + security audit via MCP. Pay per PR. Runs in CI or interactively. |
| [vindex-mcp](https://www.npmjs.com/package/vindex-mcp) | Data/Intelligence | Vehicle data over x402: VIN decode with warranty terms, recalls, reliability, and US/Canada purchase-cost estimates. USDC on Base. |
| [isocast-mcp](https://www.npmjs.com/package/isocast-mcp) | Data/Intelligence | Per-signal Polymarket weather-market data across 37 cities, with market URLs and live bucket odds. USDC on Base. |
| [moltalyzer-mcp](https://www.npmjs.com/package/moltalyzer-mcp) | Data/Intelligence | Polymarket and AI-agent-community intelligence: order-book movers, whale calibration, and multi-source digests. USDC on Base. |
[Full MCP server directory →](directory/mcp-servers.md)
---
## APIs & Services
x402-payable APIs — pay per request, no subscriptions.
| Service | Pricing | Description |
|---------|---------|-------------|
| [24K Labs Code Review API](https://24klabs.ai/code-review) [](CONTRIBUTING.md#24k-verified-tier) | $0.01-$3.00 | 6 AI code services: explain, debug, review, security audit, automation, MCP blueprint. USDC on Base. |
| [agentsvc.io](https://agentsvc.io) [](CONTRIBUTING.md#24k-verified-tier) [](https://agentsvc.io) | Per-call | 100+ AI tools via a single x402-gated endpoint. One integration, full ecosystem access. |
| [Strale](https://strale.ai) [](CONTRIBUTING.md#24k-verified-tier) | Per-token | LLM inference via x402. Pay per token, no subscription, no API key. |
| [AIsa](https://aisa.ai) [](CONTRIBUTING.md#24k-verified-tier) | Per-call | AI + crypto data fusion. Highest x402 transaction count of any API service in the ecosystem. |
| [QuickNode RPC](https://quicknode.com) [](CONTRIBUTING.md#24k-verified-tier) [](https://quicknode.com) | Per-request | Pay-per-request RPC access to 130+ chains. No node management. |
| [Arch Tools](https://archtools.io) [](CONTRIBUTING.md#24k-verified-tier) | Per-call | 27 on-chain tools. Portfolio analysis, NFT data, market intelligence on Base. |
| [ShieldAPI](https://shield.vainplex.dev) [](CONTRIBUTING.md#24k-verified-tier) [](https://github.com/alberthild/shieldapi-mcp) | $0.002–$0.05 | Security intelligence: breach check, domain reputation, URL safety, prompt injection detection. |
| [Valoria](https://x402.valoria.net) | — | Market intelligence: 90K+ indexed services, $148M+ tracked on-chain volume, revenue rankings. |
| [Firecrawl x402](https://api.firecrawl.dev/v1/x402/search) [](CONTRIBUTING.md#24k-verified-tier) | 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](https://jmt-x402-proxy.jmthomasofficial.workers.dev) | $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. |
| [Vindex](https://api.vindexapi.dev) | $0.01 | Vehicle-data API: VIN decode with factory warranty terms, recalls, known-issues/reliability, and US & Canada purchase-cost estimates. NHTSA and Transport Canada sources. USDC on Base. |
| [Isocast](https://api.isocast.dev) | From $0.01 | Per-signal Polymarket weather-market data across 37 cities. Fires when a city's daily-high temperature crosses into a new Polymarket bucket, returning the market URL and live bucket odds. USDC on Base. |
| [Moltalyzer](https://api.moltalyzer.xyz) | $0.01–$0.05 | Polymarket and AI-agent-community intelligence: order-book microstructure movers, whale hold-to-resolution calibration, and multi-source digests. USDC on Base. |
[Full API directory →](directory/apis.md)
---
## Tools & Monitoring
| Tool | Description |
|------|-------------|
| [x402-proxy](https://www.npmjs.com/package/x402-proxy) [](https://github.com/cascade-protocol/x402-proxy) | `npx x402-proxy` — cURL for x402 APIs. Auto-pays 402 with USDC on Base and Solana. MCP stdio proxy. |
| [Paybound](https://github.com/pando-b/paybound) [](CONTRIBUTING.md#24k-verified-tier) [](https://github.com/pando-b/paybound) | Open-source governance proxy. Per-agent budgets, circuit breakers, SQLite audit trail. Drop-in `@x402/fetch` replacement. |
| [Sentinel/Valeo](https://sentinel.valeocash.com) [](CONTRIBUTING.md#24k-verified-tier) | Enterprise audit layer. Budget enforcement, structured trails, real-time dashboard, public payment explorer. |
| [ScoutScore](https://scoutscore.ai) [](CONTRIBUTING.md#24k-verified-tier) | Trust scoring for x402 services. Monitors 1,700+ services with continuous health checks. |
| [x402scan](https://x402scan.com) [](CONTRIBUTING.md#24k-verified-tier) | Block explorer for x402 payments. Transaction search, payment requirement inspection, settlement status. |
| [24K Labs GitHub Action](https://github.com/Haustorium12/24klabs-action) [](CONTRIBUTING.md#24k-verified-tier) [](https://github.com/Haustorium12/24klabs-action) | AI code review + security audit on every PR via x402 micropayments. Drop into any GitHub Actions workflow. |
| [Agent Forensics](https://www.npmjs.com/package/agent-forensics) | Claude Code cost observability. Analyzes JSONL session logs: per-model cost breakdown, cache efficiency, waste patterns. Free CLI. |
| [x402station](https://x402station.com) [](CONTRIBUTING.md#24k-verified-tier) | 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](https://github.com/aws-samples/sample-x402-content-monetization-with-cloudfront-and-waf) [](https://github.com/aws-samples/sample-x402-content-monetization-with-cloudfront-and-waf) | AWS-published reference implementation for monetizing content behind CloudFront and WAF with x402 and USDC payments. |
| [LemonCake](https://lemoncake.xyz) [](https://github.com/evidai/agent-payment-mcp) | 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. |
| [Agent Café](https://api.402.coffee/docs) | The trust layer for agent payments on Base. One live x402 endpoint, three services in real USDC: **certify** a paying agent (public certificate + badge that it pays correctly, refuses over-priced scams, and checks the recipient), **score** any wallet's payment risk 0–100 before you transact (`POST /score`; free `GET /verify`), and **escrow** x402 sales with automated on-chain arbitration. Every result is a fact observed on-chain. |
[Full tools directory →](directory/tools.md)
---
## Security & Compliance
| Service | Description |
|---------|-------------|
| [ShieldAPI](https://shield.vainplex.dev) [](CONTRIBUTING.md#24k-verified-tier) [](https://github.com/alberthild/shieldapi-mcp) | x402-native security API. Breach check (900M+ HIBP hashes), domain/IP reputation, prompt injection detection. |
| [KaelAi](https://kaelai.io) | Wallet trust scoring 0-100 across 10 chains. Vet incoming/outgoing payment wallets before serving requests. |
| [MoltGuard](https://api.moltrust.ch/guard/) [](https://github.com/moltrust/moltguard) [](https://api.moltrust.ch) | Agent trust scoring, Sybil detection with funding cluster analysis, Ed25519 Verifiable Credentials. |
| [Paybound](https://github.com/pando-b/paybound) [](https://github.com/pando-b/paybound) | Governance proxy with circuit breakers and per-agent spending limits. MIT licensed. |
| [SENTINEL](https://mru-oracle.com) [](https://github.com/INJprotocol/mauritius-oracle-) | AML/CFT compliance. 77K+ sanctions entities (OFAC, UN, EU, PEP, Interpol), 159-country jurisdiction risk scoring. |
| [PolicyLayer](https://policylayer.com) [](https://policylayer.com) | Non-custodial spending controls. Daily limits, per-transaction caps, recipient whitelists — no private key custody. |
[Full security directory →](directory/security.md)
---
## Ecosystem & Wallets
| Project | Description |
|---------|-------------|
| [Coinbase Agentic Wallets](https://docs.cdp.coinbase.com/agentic-wallets) [](CONTRIBUTING.md#24k-verified-tier) | Native CDP wallets purpose-built for AI agents. Launched April 2, 2026. The reference implementation. |
| [Cloudflare Agents SDK](https://developers.cloudflare.com/agents) [](CONTRIBUTING.md#24k-verified-tier) | Edge-native agent deployment with x402 built in. v0.4.0 adds x402 v2 migration (March 2026). |
| [Agent.market](https://agent.market) [](CONTRIBUTING.md#24k-verified-tier) | Official app store for AI agents. x402-powered transactions. Launched April 20, 2026. |
| [WorkProtocol](https://workprotocol.ai) | Structured work marketplace for agents and builders. Escrow-backed jobs, on-chain reputation. |
| [Nevermined + Visa](https://pinionnewswire.com/press-release/nevermineds-visa-intelligent-commerce-x402-integration-unlocks-agentic-commerce/) | AI agents get delegated credit card spending authority via Visa Intelligent Commerce + x402 (April 2026). |
| [World AgentKit](https://www.coindesk.com/tech/2026/03/17/sam-altman-s-world-teams-up-with-coinbase-to-prove-there-is-a-real-person-behind-every-ai-transaction) | WorldID biometric identity + x402. Prove a verified human is behind every agent transaction. 18M+ verified humans. |
[Full ecosystem directory →](directory/ecosystem.md)
---
## Learning & Community
### Get Started
- [5-Minute Quickstart](https://docs.cdp.coinbase.com/x402/quickstart-for-sellers) [](CONTRIBUTING.md#24k-verified-tier) — Accept your first x402 payment.
- [x402 Protocol Spec](https://github.com/coinbase/x402) — Official open-source protocol by Coinbase.
- [Coinbase Developer Platform Docs](https://docs.cdp.coinbase.com/x402) — Complete implementation guide and API reference.
- [LearnAI x402 Course](https://www.uselearnai.com/course/x402-protocol) — Free, interactive, AI-guided. Covers the full payment flow, facilitator setup, and agent-to-agent payments.
### Essential Reading
- [24K Labs: x402 Explained](https://24klabs.ai/blog/x402-explained) — History and technical breakdown of HTTP 402.
- [AWS: x402 and Agentic Commerce](https://aws.amazon.com/blogs/industries/x402-and-agentic-commerce-redefining-autonomous-payments-in-financial-services/) — Full x402 stack with AgentCore + CloudFront + Lambda@Edge.
- [WorkOS: x402 vs Stripe MPP](https://workos.com/blog/x402-vs-stripe-mpp-how-to-choose-payment-infrastructure-for-ai-agents-and-mcp-tools-in-2026) — How to choose in 2026.
- [CoinDesk: Demand Still Unproven](https://www.coindesk.com/markets/2026/03/11/coinbase-backed-ai-payments-protocol-wants-to-fix-micropayment-but-demand-is-just-not-there-yet) — Honest March 2026 assessment. Worth reading.
### Community
- [x402 Foundation Discord](https://discord.gg/x402) — Official community. Protocol questions and announcements.
- [x402 Builders Telegram](https://t.me/x402builders) — Active developer chat.
- [GitHub Issues — coinbase/x402](https://github.com/coinbase/x402/issues) — Technical Q&A and bug reports.
- [Agent Economy Digest](https://agenteconomy.substack.com) — Weekly newsletter covering x402, MPP, A2A, and agentic commerce.
[Full learning directory →](directory/learning.md) · [Full community directory →](directory/community.md)
---
## 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 →](directory/market-data.md) · [Live dashboard →](https://agenteconomy.to) · [On-chain analytics →](https://dune.com/x402)
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## Need More?
The README is the curated magazine — handpicked entries with context and tags. The [`directory/`](directory/) folder is the exhaustive reference, with everything we know about across the x402 ecosystem.
- [Facilitators](directory/facilitators.md) — all hosted and self-hosted facilitators, hosted and self-hosted coverage tables.
- [SDKs & Libraries](directory/sdks.md) — all SDKs by language: TypeScript, Python, Rust, Go, and more.
- [Frameworks & Middleware](directory/frameworks.md) — server middleware for Express, Hono, Next.js, FastAPI, Axum, and Cloudflare Workers.
- [MCP Servers](directory/mcp-servers.md) — the full MCP ecosystem, organized by category.
- [APIs & Services](directory/apis.md) — all x402-payable API services: AI, data, infrastructure, and production deployments.
- [Tools & Utilities](directory/tools.md) — CLI tools, monitoring, analytics, spending controls, testing, and discovery.
- [Security & Compliance](directory/security.md) — audits, security tools, spending controls, trust scoring, and compliance.
- [Ecosystem & Wallets](directory/ecosystem.md) — agent wallets, frameworks, marketplaces, and infrastructure.
- [Learning Resources](directory/learning.md) — quickstarts, tutorials, articles, news, and migration guides.
- [Community](directory/community.md) — channels, newsletters, jobs, and events.
- [Market Data](directory/market-data.md) — on-chain analytics, dashboards, enterprise adoption, and growth timeline.
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## Contributing
gold-402 is curated, not exhaustive. Every entry earns its place.
See [CONTRIBUTING.md](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 Verified` tag.
- One entry per pull request. Format: `[Name](url) — Description starting uppercase, ending with period.`
- Descriptions are factual. No marketing language.
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Curated by 24K Labs
If this saved you time, star the repo.
x402.org •
Protocol Spec •
Coinbase Docs •
Discord •
Live Dashboard