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 (specifically for transaction ID 105) 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 utility services — all priced at $0.02 per call and settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/105/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds.
The platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) appear to require a wallet connection and contain no substantive content in the crawl. There is no OpenAPI spec, no detailed schema for request or response bodies, and no examples of what the receipt payload actually contains. The broader site lists many other endpoints (analytics, AI, finance, utilities) at the same $0.02 price point, but this specific listing covers only the transaction receipt resource.
Capabilities
Use cases
- —Retrieving a receipt for a specific transaction (ID 105) via programmatic pay-per-request access
- —Demonstrating x402 protocol integration for agent-driven payment flows
- —Building automated workflows that need verifiable transaction receipts
Fit
Best for
- —Developers experimenting with x402 protocol payments on Base
- —Agents that need to fetch transaction receipts without API key management
- —Low-volume, pay-as-you-go access to receipt data
Not for
- —Bulk retrieval of many different transaction receipts (only transaction 105 is exposed at this URL)
- —Users who need detailed API documentation or response schema before integrating
- —Production systems requiring SLA guarantees or documented error handling
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/105/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 request/response schema, no documentation content (all doc pages just show 'Connect wallet'), and the purpose of the receipt endpoint is not explained. This is effectively a stub listing with confirmed liveness.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown
- —All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no substantive content
- —This endpoint is scoped to a single transaction ID (105); it is unclear whether other transaction IDs are available at similar paths
- —The broader platform lists many endpoints but none have documented schemas or examples
Citations
- —The endpoint returns a 402 challenge with x402Version 1 and accepts USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/105/receipt
- —maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/transactions/105/receipt
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com