Pay-per-call transaction receipt endpoint on Base via x402, $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" transaction receipt resource via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts 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 request settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/37/receipt` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. The platform advertises no API keys, no rate limits, and instant access—payment is the only authentication mechanism.
Documentation beyond the landing page is minimal; the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format after successful payment is undocumented.
Capabilities
Use cases
- —Retrieving a transaction receipt after completing a payment flow
- —Programmatic access to receipt data without traditional API key management
- —Agent-driven workflows that need proof-of-transaction documents
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can settle USDC payments on Base L2
- —Use cases requiring no-signup, pay-as-you-go access to receipts
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume batch processing where per-request pricing is cost-prohibitive
- —Applications requiring fiat payment rails (credit card, Stripe)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/37/receipt \
-H "X-PAYMENT: <valid_x402_payment_proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, but there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty. The actual functionality behind 'Premium API Access' for this specific receipt endpoint is unclear.
Warnings
- —No OpenAPI or schema documentation available
- —All documentation pages return only a 'Connect wallet' prompt with no technical content
- —The actual response payload after successful payment is completely undocumented
- —It is unclear what data the 'transaction receipt' endpoint actually returns
Citations
- —Platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Endpoint returns 402 with maxAmountRequired of 20000 base units of USDC (USD Coin) on Basehttps://lowpaymentfee.com/api/v1/transactions/37/receipt
- —Payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/37/receipt