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 349) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call, settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/349/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 x402 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 300-second timeout.
The platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /api, /README) all appear to require a wallet connection and contain no substantive content in the crawl. As a result, there is no detailed schema documentation, no example request/response payloads, and no clarity on what data the receipt endpoint actually returns. The endpoint is confirmed live (402 challenge captured).
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 349 via programmatic payment
- —Demonstrating x402 protocol integration for agent-to-agent micropayments
- —Accessing pay-per-request infrastructure without API key management
Fit
Best for
- —Agents or developers experimenting with x402 payment flows
- —Use cases requiring keyless, per-call API access on Base
- —Micropayment-gated data retrieval
Not for
- —Users needing detailed API documentation or schemas before integrating
- —Bulk or high-volume receipt retrieval (no batch endpoint documented)
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/349/receipt \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no documentation, no request/response schema, and the purpose of this specific receipt endpoint is unclear. All doc pages require wallet connection and yield no content.
Warnings
- —No API documentation available — all doc pages require wallet connection and are empty in crawl
- —No request or response schema documented for this endpoint
- —The specific resource (transaction 349 receipt) is opaque — unclear what data it returns or what input it expects
- —Platform lists many endpoints but none have detailed documentation in the crawl
Citations
- —Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/349/receipt
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/349/receipt