Transaction receipt retrieval via x402 micropayment on Base network for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource ID 361) behind an x402 paywall. The site operates a broad suite of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required; callers simply attach an x402 payment header to each request.
The specific endpoint `/api/v1/transactions/361/receipt` is labeled "Premium API Access" and accepts POST requests. It returns application/json content. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the "exact" scheme with a 300-second timeout.
Documentation on the site is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is live (returns a proper 402 challenge), but the actual data returned after payment is unknown from the available material.
Capabilities
Use cases
- —Retrieving transaction receipt data for a specific transaction via micropayment
- —Programmatic access to receipt information without API key management
- —Agent-driven workflows that need on-demand paid data retrieval
Fit
Best for
- —Developers wanting zero-signup, pay-per-call API access
- —AI agents that can settle x402 payments in USDC on Base
- —Use cases requiring no rate limits or subscription commitments
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Bulk retrieval of many different transaction receipts (only resource 361 is exposed at this endpoint)
- —Non-crypto payment workflows — requires USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/361/receipt \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific receipt endpoint is unclear beyond its generic label. Effectively a stub listing.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content
- —No OpenAPI or schema definition found for request or response payloads
- —The actual data returned by this endpoint after payment is completely undocumented
- —This is a single resource-specific endpoint (/transactions/361/receipt); it is unclear whether other transaction IDs are accessible or what 'Premium API Access' specifically provides
Citations
- —The site advertises all APIs at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/transactions/361/receipt
- —The endpoint accepts POST requests and returns application/jsonhttps://lowpaymentfee.com/api/v1/transactions/361/receipt