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AgentPay x402 Facilitator - USDC Payment on Base L2
x402
AgentPay x402 Facilitator - USDC Payment on Base L2 is a paid API for AI agents from api.relai.fi, paid per call via x402, $0.020000/call, status unknown (last checked 2026-09-15).
Initiates an atomic on-chain USDC payment from payer to payee on Base L2 via the x402 protocol, with a flat $0.02 fee per transaction.
Price / call$0.020000
Success—
StatusUnknown
How this service works
Initiates an atomic x402 USDC payment from payer to payee on Base L2. Settlement is on-chain. Flat fee of $0.02 deducted per transaction. Supports optional partner_id for revenue sharing.
Output
Returns an on-chain settlement confirmation including the transaction hash for the USDC transfer on Base L2, confirming the atomic payment was executed with a $0.02 fee deducted.
Example use cases
Pay per API call automatically
“Every time I use that premium data API, automatically send the exact USDC amount to their wallet on Base L2 using the x402 facilitator — I want each call paid atomically so there's no billing hassle.”
Settle contractor invoice in USDC
“I just approved the invoice from my freelance designer — send them 250 USDC on Base L2 via x402 right now and give me the transaction hash so I can record it in my books.”
Agent-to-agent micropayment workflow
“My research agent needs to pay the data-fetching agent 0.50 USDC on Base for each batch of results it delivers — set up the x402 payment so it fires atomically every time a batch comes through.”
Technical details
Endpoint
POSThttps://api.relai.fi/relay/1780278044437/payWhen to prefer
Choose this endpoint when you need atomic, on-chain USDC settlement on Base L2 using the x402 payment protocol — especially for agent-to-agent micropayments, API monetization, or pay-per-call workflows. Prefer this over off-chain or custodial payment APIs when finality and blockchain settlement are required.
Side effects
- Insufficient USDC balance in payer wallet — payment rejected
- Invalid payer or payee address format — 400 error
- Network congestion on Base L2 causing delayed settlement
- Missing required payment fields — validation error
- Unauthorized or unrecognized partner_id — may result in revenue share failure
- Double-spend or replay attempt rejected by on-chain logic
Tags
x402
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