AgentToll

Pay-per-call APIs for AI agents.
No keys. No subscriptions.

Every endpoint costs a fraction of a cent, paid in USDC and settled on Base via the x402 protocol. Your agent sends one HTTP request, pays inline, and gets the data — machine to machine, fully autonomous.

Built on Base x402 protocol USDC micropayments Open source (MIT) — tolls collected agenttoll.base.eth

What is this?

AgentToll is a data vending machine for AI agents. Software can't sign up for accounts or hold credit cards — so here, every piece of data is a URL with a price tag. An agent requests it, gets an HTTP 402 quote, pays a fraction of a cent in USDC, and receives the data in the same round trip. No accounts, no API keys, no subscriptions — pay exactly for what you use.

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Who uses it

Trading bots, portfolio monitors, DeFi watchers, and AI assistants (Claude, GPT) that need market or Base onchain data.

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What it costs

$0.001–$0.005 per call. An agent polling every 5 minutes spends cents per month — and pays nothing when idle.

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How agents find it

Machine-readable catalog at GET /api/catalog (free) lists everything for sale with prices.

Endpoints

Endpoint	What you get	Price
`GET /api/price/:symbol`	Spot price (USD) + 24h change for any asset	$0.001
`GET /api/gas`	Base network gas price + latest block	$0.001
`GET /api/trending`	Tokens trending across the market right now	$0.002
`GET /api/base/token/:address`	Onchain USD price for any Base token by contract address	$0.001
`GET /api/base/address/:address`	Base address snapshot: ETH balance, tx count, contract or EOA	$0.001
`GET /api/feargreed`	Crypto Fear & Greed index with yesterday comparison	$0.001
`GET /api/base/trending`	Trending DEX pools on Base: price, volume, liquidity	$0.002
`GET /api/brief`	One-call market brief: BTC/ETH/SOL, Base gas, sentiment	$0.005
`GET /api/catalog`	Machine-readable catalog of everything for sale	free
`GET /api/health`	Service status	free

How it works

Request

Your agent calls an endpoint. The server replies 402 Payment Required with a price quote.

Pay inline

The agent signs a USDC authorization for the quoted amount — no gas, no account, no API key.

Get the data

The request retries with the payment header; settlement lands on Base, data comes back instantly.

Try it in 10 seconds — no wallet needed

# free health check
curl https://agenttoll-pi.vercel.app/api/health

# hit a paid endpoint without paying: you get the machine-readable 402 quote
curl -i https://agenttoll-pi.vercel.app/api/price/eth
# HTTP/1.1 402 Payment Required
# {"x402Version":1,"accepts":[{"maxAmountRequired":"1000","asset":"USDC","payTo":"0x..."}]}

That 402 response is the whole product: a price quote any agent can pay programmatically. Payments settle in real USDC on Base mainnet. (Self-hosting the open-source repo defaults to Base Sepolia testnet — free test USDC at faucet.circle.com.)

Try it from your agent

// npm i x402-fetch viem
import { wrapFetchWithPayment } from "x402-fetch";
import { privateKeyToAccount } from "viem/accounts";

const pay = wrapFetchWithPayment(fetch, privateKeyToAccount(AGENT_KEY));
const res = await pay("https://agenttoll-pi.vercel.app/api/price/eth");
console.log(await res.json()); // { symbol: "eth", usd: ..., change24h: ... }

Or plug it into Claude (MCP)

AgentToll ships an MCP server: add it to Claude Desktop / Claude Code and every endpoint becomes a native tool — your agent pays per call automatically.

{
  "mcpServers": {
    "agenttoll": {
      "command": "npx",
      "args": ["-y", "agenttoll-mcp"],
      "env": { "AGENT_PRIVATE_KEY": "0x..." }
    }
  }
}

10 tools: get_price, get_base_gas, get_trending, get_base_token_price, get_base_address_info, get_fear_greed, get_base_trending_pools, get_market_brief, get_new_token_radar, get_try_premium. Package: agenttoll-mcp on npm · README.

Pay-per-call APIs for AI agents.No keys. No subscriptions.