No sign-up · no API key · live now

Your agent's first paid call is free.

We removed every reason not to try the API. EUR settlement estimates are now free, every 402 shows you exactly what you'd get before you pay, and a brand-new wallet's first paid call is verified — but never charged.

Read the docs → How first-call-free works

x402 + MPP accepted USDC on Base + 4 chains EUR settlement via SEPA Instant

Four changes, shipped July 4

We audited weeks of real agent traffic hitting our 402s and fixed the funnel instead of the marketing.

FREE NOW

EUR settlement estimate — $0

The single most-probed endpoint in our catalogue was paywalled for $0.005. That was backwards: the estimate is the shop window, the 0.5% settlement fee is the product.

GET https://x402.asterpay.io/v2/x402/offramp/estimate?amount=100
→ 200, no payment needed
{ "outputAmount": 91.83, "outputCurrency": "EUR",
  "estimatedDelivery": "10 seconds (SEPA Instant)" }

NEW

First call free, per wallet

Send a normally signed x402 payment. If your wallet has never paid AsterPay, we verify the signature, funding and nonce — then serve the response without settling. Your first call costs $0 and needs zero integration changes.

One per wallet, endpoints up to $0.02, and the wallet must actually hold the USDC (that's the anti-farming gate).

NEW

See the goods before you pay

Every 402 challenge now embeds an example_response — a truthful sample of the 200 body — so an agent can judge value before committing a single cent.

HTTP/1.1 402 Payment Required
{ "accepts": [...],
  "example_response": { "prices": { "BTC": 109432.5, ... } },
  "first_call_free": { "eligible_endpoint": true, ... } }

NEW · $0.02

Agent-readiness scan, machine-callable

The same scan that powers our homepage checker is now a paid x402 endpoint. Score any public site 0–100 on MCP, agent.json, llms.txt, OpenAPI and payability — from your own agent.

GET /v2/x402/agent-readiness?url=example.com
→ 402 → pay $0.02 → { "score": 60, "bucket": "partial",
  "top_gaps": [{ "label": "Agents can't pay you yet" }] }

60 SECONDS

Try it right now

Free endpoints need nothing. Paid endpoints return a 402 with everything your agent needs — and if it's your wallet's first time, the retry is free.

# 1. Free — EUR settlement estimate
curl "https://x402.asterpay.io/v2/x402/offramp/estimate?amount=100"

# 2. Paid — hit it once to see the 402 with example_response + first_call_free offer
curl "https://x402.asterpay.io/v2/x402/crypto/prices"

# 3. Pay (or claim your free first call) with the x402 SDK
npm i @x402/fetch   # or: pip install x402

Then settle it in EUR

Everything above is the funnel. The product: USDC in, EUR in a bank account via SEPA Instant in under 10 seconds, 0.5% flat, MiCA-aligned via licensed partner rails.

EUR settlement → asterpay.io