{"uid":"cap_Vt0POh2Zha5aNwyNYW2_d","slug":"liquprop-api-9f54733e","name":"LiquProp API – Gas-Free Relay Payment","description":"Gas-free payment - RelAI sponsors transaction fees on polygon","url":"https://api.relai.fi/relay/1776502063891/","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"unknown","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2Pi-_7XD7o2gHpFNCFm42","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Submits a blockchain transaction on Polygon with RelAI sponsoring the gas fee, enabling gas-free payments via x402 protocol","exampleAgentPrompt":"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.","exampleUseCases":null,"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:28:45.367Z","isFirstParty":false}