Transaction receipt endpoint on Base, paid per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt resource at `/api/v1/transactions/269/receipt`. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all settled via the x402 protocol on the Base network using USDC.
The specific endpoint probed returns a 402 challenge requesting payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is made via the x402 "exact" scheme to the specified wallet address. The platform advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and instant access.
However, the actual functionality behind this particular receipt endpoint is unclear. The existing title is simply "Premium API Access" and no OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without documentation or sample payloads, it is difficult to determine what data this endpoint returns or what inputs it expects beyond a POST request.
Capabilities
Use cases
- —Retrieving a transaction receipt for a specific transaction ID via paid API call
- —Demonstrating x402 protocol payment flows for agent-to-agent commerce
- —Integrating pay-per-call APIs without traditional API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents needing no-auth, pay-per-call API access
- —Projects requiring USDC-settled micropayment endpoints
Not for
- —Production workloads requiring documented, well-specified API contracts
- —Users who need free or subscription-based API access
- —Applications requiring detailed response schema guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/269/receipt
# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof on Base to access.Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), but there is no OpenAPI schema, no documentation, no request/response examples, and the crawled docs pages are empty stubs. The purpose of this specific receipt endpoint is unclear beyond its title. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content
- —The specific functionality of /api/v1/transactions/269/receipt is undocumented — unclear what data it returns
- —The endpoint path includes a hardcoded transaction ID (269), suggesting it may be a single-resource endpoint rather than a general-purpose API
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/269/receipt
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/269/receipt