x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides access to a transaction receipt (transaction ID 82) behind an x402 paywall. It is part of a broader platform offering multiple pay-per-request API categories including 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/82/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers receive a 402 challenge specifying the USDC asset on Base (contract 0x8335…2913), a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals), and a payTo address. No API keys or rate limits are advertised; access is gated purely by micropayment.
Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The platform lists many other endpoints across analytics, AI, finance, and utility categories, but details about what data each returns are not provided. The endpoint is confirmed live (402 challenge captured successfully).
Capabilities
Use cases
- —Retrieving a receipt for transaction #82 via micropayment
- —Demonstrating x402 protocol integration for pay-per-request APIs
- —Agent-driven payment flows where no API key provisioning is desired
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can settle USDC micropayments on Base
- —Use cases requiring keyless, pay-as-you-go API access
Not for
- —Users needing detailed API documentation or schemas before integrating
- —High-volume batch retrieval where per-request fees add up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/82/receipt
# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment on Base to access.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific receipt endpoint is unclear beyond its URL path. The listing is effectively a stub.
Warnings
- —Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content.
- —No OpenAPI or schema documentation available for request or response formats.
- —The specific purpose and data returned by /api/v1/transactions/82/receipt is undocumented — it is unclear what 'transaction 82' refers to.
- —The platform lists many endpoints but provides no detail on what any of them actually return.
Citations
- —Endpoint returns 402 with x402 challenge specifying USDC on Base, maxAmountRequired 20000 (=$0.02)https://lowpaymentfee.com/api/v1/transactions/82/receipt
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/82/receipt
- —Docs, API, pricing, and README pages render only 'Connect wallet'https://lowpaymentfee.com/docs