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Protocol · x402

HTTP with a payment header.

x402 revives the original HTTP 402 status code and turns it into a payment rail. Hit an endpoint, get a price, pay in stablecoin, get your response. No accounts, no API keys, no monthly contracts. Our services live on this rail.

View servicesLearn about x402

How it works

  1. 01 Client calls the endpoint.
  2. 02 Server responds with 402 and a price quote.
  3. 03 Client attaches a stablecoin payment header.
  4. 04 Server settles, returns the data.

Services

Live on the rail.

Service 01Live

Signal

Market signals, billed per request.

A focused, low-latency feed of asset signals with a conviction score. Built for traders and automated systems that want a price-per-call data line instead of a subscription.

  • Per-call USDC pricing
  • Sub-second latency
  • Open to any x402 client
●signal.quickai.build
signal.quickai.build
$ curl signal.quickai.build
402 Payment Required

$ curl --pay signal.quickai.build
{
  "asset": "SOL",
  "signal": "long",
  "conviction": 0.82,
  "ts": 1748409200
}
Service 02Beta

Eagle Eye

Destination wallet compliance, in one call.

Check any destination wallet against OFAC sanctions, public blacklists, and known illicit-flow heuristics before you send. Designed for fintechs, exchanges, and payment apps that need a clean compliance line without a vendor contract.

  • OFAC SDN screening
  • Aggregated blacklist coverage
  • Risk score with rationale
●eagle.quickai.build
eagle.quickai.build
$ curl --pay \
    eagle.quickai.build/check\
    ?addr=0x9f8a…
{
  "address": "0x9f8a…",
  "ofac": false,
  "blacklists": [],
  "risk": "low",
  "score": 0.04
}
Service 03Live

Quick ZK Auth

ZK-powered wallet qualification for agentic commerce.

Prove a wallet is funded without exposing the address. Combines a Semaphore ZK membership proof (wallet ownership) with a USDC balance attestation at a snapshot block. Returns an attested bundle linkable to x402 payment and ERC-8004 evidence envelopes.

  • Semaphore ZK proof of wallet ownership
  • USDC balance attestation on Base
  • ERC-8004 compatible evidence envelope
  • x402 pay-per-call ($0.05)
●zk.quickai.build
zk.quickai.build
$ curl --pay https://zk.quickai.build/prove \
  -X POST \
  -d '{"wallet":"0x…","min_balance_usdc":1000}'
{
  "job_id": "550e8400-…",
  "valid": true,
  "claims": {
    "ownership_proof_type": "semaphore_zk",
    "balance_proof_type": "rpc_attestation"
  },
  "x402_payment_ref": "pending_settlement"
}