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LiquProp API – Gas-Free Relay Payment
x402
LiquProp API – Gas-Free Relay Payment is a paid API for AI agents from api.relai.fi, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Submits a blockchain transaction on Polygon with RelAI sponsoring the gas fee, enabling gas-free payments via x402 protocol
Price / call$0.01
Success—
StatusDown
How this service works
Gas-free payment - RelAI sponsors transaction fees on polygon
Output
A relay confirmation response including the transaction hash and receipt indicating that RelAI successfully submitted and paid for the gas on the Polygon network on the caller's behalf.
Example use cases
Example prompt
“Send a gas-free USDC payment on Polygon using RelAI's relay — I don't want to pay any gas fees myself, so have RelAI sponsor the transaction fees for a 0.01 USDC call.”
Technical details
Endpoint
POSThttps://api.relai.fi/relay/1776502063891/When to prefer
Use this endpoint when you need to execute Polygon transactions without holding MATIC for gas, or when building applications where end-users should not be burdened with gas fee management. Ideal for x402-protocol payment flows where RelAI's gas sponsorship simplifies the UX.
Side effects
- Insufficient USDC balance to cover the $0.01 per-call fee
- Invalid or malformed transaction payload returns 400 error
- Relay service temporarily unavailable returns 503
- Polygon network congestion causing delayed or failed relay
- x402 payment header missing or invalid returns 402
Tags
x402
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