Transaction receipt endpoint on Base, paid per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt resource at `/api/v1/transactions/279/receipt`. It is part of a broader platform that offers multiple x402-gated 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 probed returns a 402 challenge requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) via the x402 "exact" scheme. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.
The platform advertises no API keys, no rate limits, and instant access. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve to a minimal "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The actual data returned by this receipt endpoint — and indeed by most endpoints on the platform — is undocumented, so callers must discover behavior empirically.
Capabilities
Use cases
- —Retrieving a transaction receipt via a single paid API call
- —Demonstrating x402 payment flow integration on Base
- —Agent-driven micropayment workflows for on-chain data
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need pay-per-call access without API keys
- —Low-cost per-request data retrieval on Base
Not for
- —Production workloads requiring documented request/response schemas
- —Use cases needing bulk or subscription-based pricing
- —Users who cannot pay in USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/279/receipt
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid payment to receive the receipt.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and all documentation pages are empty stubs. The purpose of this specific receipt endpoint is unclear beyond its URL path.
Warnings
- —No OpenAPI or schema documentation available — all doc pages return only a 'Connect wallet' stub.
- —The actual response payload for this receipt endpoint is completely undocumented.
- —The platform lists many endpoint categories but none have published technical documentation.
- —It is unclear what transaction ID 279 refers to or whether the receipt endpoint is parameterized.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.https://lowpaymentfee.com/api/v1/transactions/279/receipt
- —The platform advertises $0.02 per request, no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) resolve to a minimal 'Connect wallet' prompt.https://lowpaymentfee.com/docs