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 (specifically for transaction ID 75) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per call, settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/75/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 x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.
The platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /api, /README) all resolve but appear to require a wallet connection to view content, so detailed schema information for request/response bodies is not available from the crawl. The broader site lists 16 endpoints across four categories, all at the same $0.02 price point. Without deeper documentation, the exact fields returned in the receipt response or the expected POST body remain unknown.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 75 via a single micropayment
- —Demonstrating x402 protocol integration for pay-per-request APIs
- —Programmatic access to financial transaction data without API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need on-demand transaction receipts without subscription overhead
- —Low-volume, pay-as-you-go API consumption on Base
Not for
- —High-volume batch retrieval of many transaction receipts (no bulk pricing disclosed)
- —Users who need detailed API documentation before integrating (docs require wallet connection)
- —Non-crypto users who cannot settle payments in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/75/receipt \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages require wallet connection, yielding no usable content. The specific purpose of this particular receipt endpoint (transaction 75) is opaque.
Warnings
- —All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt — no usable docs available without wallet authentication.
- —No request body schema or response schema is documented or discoverable.
- —The endpoint is for a specific transaction ID (75); it is unclear whether this is a demo resource or a real transaction receipt.
- —The broader platform lists many endpoints but none have detailed documentation available from the crawl.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/transactions/75/receipt
- —All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages resolve but display only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs