x402-gated transaction receipt endpoint on Base, paid per-call in USDC.

This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 39) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including 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/39/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the accepted payment scheme (exact), the USDC asset contract on Base (`0x8335…`), and a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). No API keys or rate limits are advertised; access is granted purely through per-request micropayment.

The platform's landing page lists additional endpoints spanning sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during the crawl. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. Because of this, the actual data returned by this receipt endpoint and the broader platform's endpoints remains unclear.