x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 273) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call, settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/273/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The platform markets itself as requiring no API keys, no rate limits, and no commitments — just per-request micropayments. Documentation pages (/docs, /pricing, /api, /README) all appear to require a wallet connection and contain no substantive content in the crawl, so the actual response schema and detailed API documentation are unknown. The endpoint is confirmed live (402 challenge captured).
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 273 via micropayment
- —Programmatic access to receipt data without API key registration
- —Agent-driven workflows that need on-chain-settled receipt retrieval
Fit
Best for
- —Developers wanting keyless, pay-per-call API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer micropayments over subscription billing
Not for
- —Bulk retrieval of many transaction receipts (no batch endpoint documented)
- —Users who need detailed API documentation before integrating (docs are sparse)
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/273/receipt \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and all documentation pages returned only a 'Connect wallet' prompt with no usable content. The specific purpose of this receipt endpoint is unclear beyond its URL path.
Warnings
- —No API documentation available — all doc pages require wallet connection and contain no content
- —Response schema for the receipt endpoint is completely unknown
- —The endpoint path references a specific transaction ID (273); it is unclear whether this is a generic pattern or a single fixed resource
- —No OpenAPI or machine-readable schema provided
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/273/receipt
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/273/receipt
- —All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com