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 (resource ID 291) behind an x402 paywall. The site advertises itself as a platform hosting multiple pay-per-call API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/291/receipt` returns a JSON response upon payment. The x402 challenge confirms the endpoint is live, accepting exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) to address 0x1A2B…85F3. No API keys or rate limits are advertised; access is granted purely via the x402 payment header. The POST method is required.
Documentation on the site is extremely thin — 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 broader platform lists many endpoints across analytics, AI, finance, and utility categories, but without documentation it is unclear what data or functionality each actually provides. The transaction receipt endpoint's purpose and response format remain unverified beyond the x402 challenge metadata.
Capabilities
Use cases
- —Retrieving a transaction receipt for resource ID 291 via micropayment
- —Demonstrating x402 protocol payment flows on Base
- —Agent-driven pay-per-call data retrieval without API keys
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless, pay-per-call API access on Base
- —Low-cost single-request data retrieval settled in USDC
Not for
- —Users needing detailed API documentation or schemas before integrating
- —High-volume batch processing where per-request fees add up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/291/receipt \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation: no OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The specific purpose of this transaction receipt endpoint is unexplained.
Warnings
- —No OpenAPI spec or request/response schema available
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content
- —The actual data returned by this endpoint is unknown — 'Premium API Access' and 'transaction receipt' are the only descriptors
- —The broader platform lists many endpoints but none have documented behavior
Citations
- —The endpoint returns HTTP 402 with x402 challenge advertising USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/transactions/291/receipt
- —All endpoints priced at $0.02 per request 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/291/receipt
- —Documentation, API, pricing, and README pages all show only 'Connect wallet'https://lowpaymentfee.com/docs