GET /v1/catalogFREE
Agent-readable routes, prices, request examples, and guidance on when to use each diagnostic.
x402 discovery entryBase mainnet · x402 · USDC
ExactGate
Transaction answers before you sign. Deterministic receipt verification, live chain health, and call preflight—no account, no API key, no broadcast.
● LIVE
Network: eip155:8453
Settlement: PayAI facilitator
Response: application/json
Network: eip155:8453
Settlement: PayAI facilitator
Response: application/json
Pay only for the answer
GET /v1/base/network-health$0.001
Block height, timestamp, gas price, chain ID, and measured RPC latency.
x402 exact / USDCGET /v1/base/receipt$0.005
Status, confirmations, gas, fee, contract creation, and log count for one Base transaction.
?txHash=0x…POST /v1/base/preflight$0.020
eth_call + gas estimate + bytecode + pending nonce. Simulation only; never signs or broadcasts.
{ to, from?, data?, value? }Machine-first contract
curl -i -X POST "https://exactgate-x402.insertnameheree.chatgpt.site/v1/base/preflight" \
-H 'content-type: application/json' \
-d '{"to":"0x1111111111111111111111111111111111111111","data":"0x"}'
HTTP/2 402
PAYMENT-REQUIRED: <base64 x402 v2 requirements>