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 (transaction ID 316) 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 infrastructure utilities — all priced at $0.02 per call and settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/316/receipt` accepts POST requests and returns JSON. 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. Payment is made via the x402 exact scheme with no API keys, rate limits, or subscriptions required — callers simply attach the X-PAYMENT header with a valid payment proof.
The platform's landing page lists 16 endpoints across four categories (Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure), all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling — the docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. The actual behavior and response format of this particular receipt endpoint remain undocumented.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 316 via a single paid API call
- —Programmatic access to receipt data without API key management
- —Agent-driven workflows that need on-chain-settled, per-request payment
Fit
Best for
- —Developers exploring x402 payment flows on Base
- —Agents that need keyless, pay-per-use API access
- —Prototyping micropayment-gated receipt retrieval
Not for
- —Production use requiring documented request/response schemas
- —Bulk or high-volume receipt retrieval (no batch endpoint documented)
- —Users who need fiat-only payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/316/receipt \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no example requests or responses, and the docs/pricing/README pages are all empty stubs. The specific purpose of this receipt endpoint is unclear beyond its URL path.
Warnings
- —No OpenAPI or schema documentation available — request body and response format are unknown.
- —All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content.
- —The specific purpose and data returned by /api/v1/transactions/316/receipt is undocumented.
- —This appears to be a single hard-coded transaction ID (316); unclear if other transaction IDs are supported.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/transactions/316/receipt
- —The platform lists 16 endpoints across four categories all priced at $0.02 per requesthttps://lowpaymentfee.com
- —Platform advertises no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com