Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This x402-enabled endpoint at lowpaymentfee.com provides a transaction receipt for transaction ID 139 via a POST request. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/139/receipt` returns a JSON response (MIME type `application/json`) and requires an x402 payment header. The x402 challenge confirms the endpoint is live, advertising a max amount of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.
The platform advertises no API keys, no rate limits, and instant access. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a "Connect wallet" prompt with no substantive content, so the actual behavior, request parameters, and response schema for this endpoint are unknown. The endpoint appears to be one of many on the platform, but the specific purpose of a "transaction receipt" for a hardcoded transaction ID 139 is unclear — it may be a demo or placeholder endpoint.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 139 via a single paid API call
- —Demonstrating x402 payment protocol integration on Base
- —Agent-driven pay-per-call access without API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless, pay-per-call API access on Base
- —Testing USDC micropayment flows
Not for
- —Production use cases requiring documented request/response schemas
- —Bulk or high-volume transaction receipt retrieval
- —Users who need free or subscription-based API access
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/139/receipt \
-H "X-PAYMENT: <x402-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and confirms pricing and network details, but all documentation pages are empty (showing only 'Connect wallet'). No request parameters, response schema, or meaningful docs are available. The endpoint path references a hardcoded transaction ID, making its general utility unclear.
Warnings
- —All documentation pages (/docs, /pricing, /api, /README) returned no content beyond 'Connect wallet'
- —No request body schema or response schema documented anywhere
- —Endpoint references a specific transaction ID (139) — unclear if this is parameterizable or a fixed demo
- —No OpenAPI spec, no AI plugin manifest, no robots.txt, no agents.txt found
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/139/receipt
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/139/receipt