Intelligence your
agent can buy
by the call.
74 pay-per-call AI services on the x402 V2 protocol — market intelligence, DeFi execution, AI creative tools — settled in USDC on Base, Polygon, or Solana. Permit2-ready for any ERC-20. Sign-In-With-X repeat access on select read endpoints (data endpoints are pay-per-call). Indexed on x402scan and the Bazaar discovery extension. From $0.001 per call.
Three steps. No keys.
Discover the catalog, hit any endpoint, get a 402 with the payment requirements, sign once with Permit2 — SIWX re-access is available on select read endpoints (data endpoints are pay-per-call). Works with any x402-compatible wallet or agent.
Read the catalog
Fetch /llm.txt for the machine-readable catalog, or browse the Bazaar discovery extension on any route.
curl https://x402.ottoai.services/llm.txt
Hit an endpoint
Any GET returns 402 Payment Required with the network options, recipient address, and asset.
curl -i https://x402.ottoai.services/token-alpha?symbol=ETH HTTP/1.1 402 Payment Required x-payment-requirements: {...}
Sign & retry
Sign a Permit2 authorization with any x402 wallet (SIWX re-access on select read endpoints) and replay the request with the payment proof.
npm i @x402/client import { pay } from '@x402/client'
Don't know which endpoint? Ask the Router.
Meta Intelligence is one call that recommends the best x402 services for your task — ranked across both Otto's own catalog and the live, public CDP Bazaar, each with its real price and a ready-to-call pay_url. Otto only recommends; you pay each service directly. Non-custodial, zero markup, no prepay wallet. $0.001 per call — a flat router fee, never a markup on the services it recommends.
POST one question
Send what you need. The Router classifies the intent and scores candidates from Otto and the Bazaar.
curl -X POST https://x402.ottoai.services/meta-intelligence \ -H 'content-type: application/json' \ -d '{"ask":"crypto news for bitcoin","price_cap_usd":0.05}'
Two labeled pools
otto_verified (our catalog) and open_bazaar_candidates (live CDP Bazaar) — each row carries price, pay_url, blunt source & verification labels. Then pay whichever you choose, directly — or let Full Auto do it for you (below).
"otto_verified": [{ "name":"Crypto News", "price_usd":0.001, "pay_url":"https://x402.ottoai.services/crypto-news" }], "open_bazaar_candidates": [{ "source":"cdp-bazaar", … }]
Don't even want to pick? Full Auto pays for you.
One call. The Router picks the best-matched Otto service, pays it on your behalf at-cost, and returns the data — no prepay, no standing balance, no API keys. You're charged the actual service cost plus a flat $0.001 router fee, never above the cap you set.
curl -X POST https://x402.ottoai.services/full-auto \ -H 'content-type: application/json' \ -d '{"ask":"crypto news for bitcoin","price_cap_usd":0.05}' # → Otto routes, pays the best service, returns the data + a receipt
Don't like what you paid for? Get your money back.
Pay a recommended Otto service (or use Full Auto) and aren't happy? Leave feedback with a short reason and Otto refunds the service fee plus the Meta/router fee — or the whole Full Auto charge. Refunds are capped at $0.01 per transaction, up to 10× per wallet per day (≥50-word reason, paid only to the original payer, never more than you paid Otto). The guarantee covers Otto's own recommended services and Full Auto — not third-party CDP Bazaar picks (there's no receipt to verify).
Every service, priced clearly.
Eight capability tags. Click any row to inspect parameters, generate a request, or fire a Try call against the live service. Prices are floor-priced in USDC — most requests settle in under 2 seconds.
Same catalog. Three rails.
x402 is the canonical surface. If you need IETF-standard cards plus stablecoins, use MPP. If you need gasless Circle Gateway batched settlement for nanopayments, use USDC.