[ x402 / pay per request ]

Pay per request.

Your wallet is the payment method. Send a request, sign the quote in USDF, and receive the result with an onchain receipt. No API key.

Get a quote Read the docs

// 01 / quote

The price.
Before the payment.

Choose a model and an output limit. The gateway returns a quote for this request. Getting a quote does not charge your wallet.

Model
llama-3.1-8b-instruct
USDF or USDG – wallet-signed paymentView pricing

// 02 / the payment path

Request. Quote. Sign. Receive.

01

Send a request

Choose a model and send the request with no account and no API key.

request

02

Receive a quote

The gateway returns the exact amount and the accepted payment methods before you pay.

402 payment required

03

Sign the payment

Your wallet or agent signs the quoted payment in USDF or USDG.

wallet signature

04

Receive the result

Resend with the payment header. The response includes a receipt tied to an onchain settlement.

response + receipt

// 03 / the first request

Start with a request.
Not a signup.

POST to the payment endpoint with no credentials. A 402 response carries the quote. Sign the payment and retry with the payment header.

Read the payment guide
POST /x402/v1/chat/completionscURL
The request example is unavailable until the live model catalog loads.
// 04 / payment methods
Two assets. One payment path.
USDF / Permit2
Approve once.
Sign each request.
Approve USDF to Permit2 once. That onchain approval needs ETH on Robinhood Chain for gas. Every payment after it is a signature with no gas.
Permit2
0x000000000022D473030F116dDEE9F6B43aC78BA3
USDG / EIP-3009
Sign directly.
No gas required.
USDG payments use an EIP-3009 authorization. No gas is needed, including the first payment.
Get USDF 
// 05 / request policy
Your privacy policy travels with you.
Set provider.zdr, provider.data_collection, or provider.private in the request body. The receipt carries the route’s data_policy.
Read the privacy policy Verify a receipt 
[ facts ]
Backed 1:1 by USDG held in the token contract.
Redeemable 1:1 at any time. Foundry cannot pause redemption.
The reserve is verifiable onchain every block.
Zero custom contract code: the token is the stock OpenZeppelin wrapper.
Zero fees in or out. Every model at list price.
Holding USDF earns weekly. No staking, no lock.
Agents pay with no account.
Every receipt ties to an onchain settlement.
Redemption depends on USDG transfers succeeding: USDG is issued by a regulated issuer that retains pause and freeze powers over its own token.
Redemption depends on USDG transfers succeeding: USDG is issued by a regulated issuer that retains pause and freeze powers over its own token.
Compute, paid
one request at a time.