Pay-per-call API Marketplace

Give Your AI Tools

The registry of battle-tested, pay-per-call tools for AI agents. Micropayments via crypto — no API keys, no subscriptions.

Tools are faster, cheaper, and more reliable than LLM calls
Task: sqrt(144) + 15 * 8 - 47
🤖 LLM Call (Gemini, Claude, GPT)
Latency
~800ms
Cost
$0.003
Accuracy
~95%
🔧 Tool Use (Calculator API)
Latency
2ms
Cost
$0.0001
Accuracy
100%
Live Now

Manage your API or use one as a developer

📤

Service Providers

Monetize your APIs instantly. Register an endpoint, set your price, get paid in crypto per call.

Add Your API →
🔍

Developers

Search, test, and integrate endpoints. Fork & improve existing tools. Version everything.

Browse Endpoints →
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Endpoints
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Searchable
$0.001
Starting price
⚡

400x Faster

Tools execute in milliseconds.

✓

100% Accurate

Deterministic. No hallucinations.

💰

30x Cheaper

Micro-amounts per call.

🔑

Ownable

Popular tools launch tokens.

Integrate in 5 Lines

Drop-in fetch wrapper handles payments automatically

📄 JavaScript / Node.js 
// Install: npm install @x402/fetch @x402/evm viem

import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

// Create a payment-enabled fetch (Base Mainnet)
const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPayment = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [
    { network: "eip155:8453", client: new ExactEvmScheme(account) },
  ],
});

// Call any x402 endpoint - payment is automatic!
const response = await fetchWithPayment("https://gg402.vercel.app/book_summary", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({ title: "The Great Gatsby" })
});

const data = await response.json();
console.log(data);

Add Your API

Paste a curl command. Set your price. Start earning crypto per call.

Prefer to register programmatically? POST /x402/register — $0.01/call 
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPayment = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(account) }],
});

const response = await fetchWithPayment("https://gg402.vercel.app/x402/register", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    url: "https://api.example.com/my-endpoint",
    method: "POST",
    price: "$0.01",
    network: "eip155:8453",
    description: "Generate custom images from text prompts",
    inputSchema: { prompt: { type: "string", required: true } },
    outputSchema: { imageUrl: { type: "string" }, success: { type: "boolean" } }
  })
});
📚 Add your API documentation
Provide any combination — we'll merge them to generate the most accurate endpoint config and examples.
Auto-detects: URL, method, headers, API key, query params. 🔒 Keys stored encrypted, never shared
🚀 Registration Process:
1 Parse curl command (free)
2 Test endpoint — must pass (free)
3 Pay $0.01 & save to marketplace
4 Save working example with real response
💡 You won't be charged if validation fails
🔒 Your API keys are encrypted at rest and never sent to AI — only sanitized metadata is used for parsing
🪙 Token payments unlocked after usage! Once your API hits 100 calls/day or 10 calls/day for 3 days, you can launch a token or accept existing tokens. Learn more →
✓ Endpoint will be tested before registration

🪙 API Coins

Tokens for APIs that have proven to work. Real usage = real utility value.

🎯 Real-Usage Required: Only APIs hitting usage milestones can launch tokens
💎 Unlock API Value: Own a piece of the tools AI agents actually use
📈 Demand-Driven: Apps and AI create natural buy pressure—not hype

These APIs are closest to token launch. Use them to accelerate eligibility:

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