402index

Search 15,000+ paid API endpoints across the L402, x402, and MPP protocols on 402index.io

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "402index-2": {
      "command": "npx",
      "args": [
        "-y",
        "402index-2"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

402 Index

Protocol-agnostic directory of paid APIs for AI agents.

What it is: a registry of HTTP 402–priced APIs across every major machine-payment protocol — L402 (Lightning), x402 (stablecoins), and MPP (Stripe/Tempo) — surfaced to AI agents via HTTP, RSS, Nostr, and MCP.

Who it's for: AI-agent developers looking for services to call, and API providers looking to get discovered by agents. The directory is community-owned: open source, MIT-licensed, no captive protocol.

Where it lives: 402index.io (production) · @402index (digest) · GitHub Issues (roadmap).

Quickstart

For agents (MCP)

One command adds 402 Index discovery + payment to any MCP host (Claude Desktop, Cursor, Cline, Windsurf):

Terminal

npm install -g @402index/mcp-server

Then register it with your MCP host — see mcp-server/README.md for per-client instructions.

For agents (HTTP)

bash

# Semantic search
curl "https://402index.io/api/v1/services?q=weather&verified=true&limit=10"

# Filter by protocol
curl "https://402index.io/api/v1/services?protocol=L402&health=healthy"

Full API reference at 402index.io/api-docs.

For API providers

Self-serve: POST https://402index.io/api/v1/register with your endpoint URL. The probe validates the 402 challenge, detects L402 and/or x402 support, and lists automatically.
Pull request: add a YAML file under listings/ — see CONTRIBUTING.md.
Already on Bazaar, Satring, or l402apps? You're already indexed — no action needed.

For contributors

bash

git clone https://github.com/ryanthegentry/402index.git
cd 402index
npm install
npm test                # Run tests (node:test)
npm run dev             # Start dev server (nodemon)
npm run poll            # Pull from Bazaar + Satring manually
npm run healthcheck     # Run health checks manually

What's in the registry

Tens of thousands of endpoints across hundreds of verified providers, aggregated from the x402 Bazaar, Satring, l402apps.com, MPP's OpenAPI directory, and direct self-submissions — no gatekeeping by protocol.

Live numbers at 402index.io/api/v1/health.

Architecture

Node.js + Express, SQLite via better-sqlite3, static HTML via template literals (no framework).
Aggregators (src/aggregators/) poll Bazaar / Satring / l402apps on a schedule and upsert normalized listings.
Health checker (src/health/checker.js) probes listings on a configurable interval, defaulting to 60 minutes (HEALTH_CHECK_INTERVAL_MS), with SSRF-safe fetch, records status, emits events.
Semantic search via sqlite-vec + hybrid LIKE/vector re-rank, with circuit-breaker fallback to LIKE-only when the embeddings service is down.
Distribution: HTTP API, MCP server, RSS, Nostr (NIP-99), webhooks (HMAC-SHA256).
Verifier handles BOLT11 invoices (L402) and ERC-20 stablecoin challenges (x402), including x402-over-Lightning.

Deeper notes in CLAUDE.md and docs/.

Project layout

Code

402index/
├── src/               # Application code (routes, aggregators, services, views)
├── mcp-server/        # @402index/mcp-server (published to npm)
├── listings/          # YAML listings for manually curated / exclusive providers
├── test/              # Tests (node:test)
├── scripts/           # Ops scripts (poll, healthcheck, backfills)
├── docs/              # Specs, API docs, protocol notes
└── .github/workflows/ # CI

Contributing

PRs welcome for listings, code, and docs. See CONTRIBUTING.md for the fork-branch-PR flow and CLAUDE.md for code style and the bug-fix protocol (failing-test-first).

Roadmap is the open issues list. Good starter tasks have the good-first-issue label.

Security

Please do not open a public issue for suspected vulnerabilities. See SECURITY.md for responsible-disclosure contacts and the threat model summary.

License

MIT. Use it, fork it, ship it.

Built by @ryanthegentry and the community. Questions → hello@402index.io or GitHub Discussions.

Read the full README →View source on GitHub →

Related MCP Servers

View all in Finance & Fintech View all alternatives

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about 402index

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "402index": { "command": "npx", "args": ["-y", "402index"] } }

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Technical Specs & Signals

CategoryFinance & Fintech

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

★ Featured

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MCP & Agent Skills for Automated Documentation, and codebase conventions + context

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More in 💰 Finance & Fintech →Best MCP servers for Finance & Fintech →Alternatives to 402index →Install in Claude Desktop Install in Cursor Install in VS Code

402index

Search 15,000+ paid API endpoints across the L402, x402, and MPP protocols on 402index.io

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "402index-2": {
      "command": "npx",
      "args": [
        "-y",
        "402index-2"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

402 Index

Protocol-agnostic directory of paid APIs for AI agents.

Where it lives: 402index.io (production) · @402index (digest) · GitHub Issues (roadmap).

Quickstart

For agents (MCP)

One command adds 402 Index discovery + payment to any MCP host (Claude Desktop, Cursor, Cline, Windsurf):

Terminal

npm install -g @402index/mcp-server

Then register it with your MCP host — see mcp-server/README.md for per-client instructions.

For agents (HTTP)

bash

# Semantic search
curl "https://402index.io/api/v1/services?q=weather&verified=true&limit=10"

# Filter by protocol
curl "https://402index.io/api/v1/services?protocol=L402&health=healthy"

Full API reference at 402index.io/api-docs.

For API providers

Self-serve: POST https://402index.io/api/v1/register with your endpoint URL. The probe validates the 402 challenge, detects L402 and/or x402 support, and lists automatically.
Pull request: add a YAML file under listings/ — see CONTRIBUTING.md.
Already on Bazaar, Satring, or l402apps? You're already indexed — no action needed.

For contributors

bash

git clone https://github.com/ryanthegentry/402index.git
cd 402index
npm install
npm test                # Run tests (node:test)
npm run dev             # Start dev server (nodemon)
npm run poll            # Pull from Bazaar + Satring manually
npm run healthcheck     # Run health checks manually

What's in the registry

Live numbers at 402index.io/api/v1/health.

Architecture

Node.js + Express, SQLite via better-sqlite3, static HTML via template literals (no framework).
Aggregators (src/aggregators/) poll Bazaar / Satring / l402apps on a schedule and upsert normalized listings.
Health checker (src/health/checker.js) probes listings on a configurable interval, defaulting to 60 minutes (HEALTH_CHECK_INTERVAL_MS), with SSRF-safe fetch, records status, emits events.
Semantic search via sqlite-vec + hybrid LIKE/vector re-rank, with circuit-breaker fallback to LIKE-only when the embeddings service is down.
Distribution: HTTP API, MCP server, RSS, Nostr (NIP-99), webhooks (HMAC-SHA256).
Verifier handles BOLT11 invoices (L402) and ERC-20 stablecoin challenges (x402), including x402-over-Lightning.

Deeper notes in CLAUDE.md and docs/.

Project layout

Code

402index/
├── src/               # Application code (routes, aggregators, services, views)
├── mcp-server/        # @402index/mcp-server (published to npm)
├── listings/          # YAML listings for manually curated / exclusive providers
├── test/              # Tests (node:test)
├── scripts/           # Ops scripts (poll, healthcheck, backfills)
├── docs/              # Specs, API docs, protocol notes
└── .github/workflows/ # CI

Contributing

PRs welcome for listings, code, and docs. See CONTRIBUTING.md for the fork-branch-PR flow and CLAUDE.md for code style and the bug-fix protocol (failing-test-first).

Roadmap is the open issues list. Good starter tasks have the good-first-issue label.

Security

Please do not open a public issue for suspected vulnerabilities. See SECURITY.md for responsible-disclosure contacts and the threat model summary.

License

MIT. Use it, fork it, ship it.

Built by @ryanthegentry and the community. Questions → hello@402index.io or GitHub Discussions.

Read the full README →View source on GitHub →

Related MCP Servers

View all in Finance & Fintech View all alternatives

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about 402index

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "402index": { "command": "npx", "args": ["-y", "402index"] } }

AllMCPs Directory Badge

Full Badge Customizer

Showcase your server listing on GitHub or your project documentation. Embed this dynamic SVG badge to highlight official listing status and live engagement.

Badge Style:

Live Dynamic SVG Preview

Markdown (GitHub README)

[![AllMCPs](https://allmcps.com/api/badge/402index-2?style=directory)](https://allmcps.com/mcp/402index-2)

HTML Embed

<a href="https://allmcps.com/mcp/402index-2"><img src="https://allmcps.com/api/badge/402index-2?style=directory" alt="402index on AllMCPs" /></a>

Technical Specs & Signals

CategoryFinance & Fintech

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

★ Featured

Moxie Docs MCP

MCP & Agent Skills for Automated Documentation, and codebase conventions + context

Explore Server →

Own this project?

Free dofollow backlink: add your website and place the AllMCPs badge on it — no claim needed. We detect it automatically and keep it verified as long as the badge stays live.

Claim & get free dofollow

Share & Embed

Add our SVG badge (dark/light directory styles) or embeddable widget to your site.

Explore more

More in 💰 Finance & Fintech →Best MCP servers for Finance & Fintech →Alternatives to 402index →Install in Claude Desktop Install in Cursor Install in VS Code