x402-gated transaction receipt endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 97) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/97/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the accepted payment scheme (exact), the USDC asset contract on Base (`0x8335…`), and a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). No API keys or rate limits are advertised; access is granted purely through per-request micropayments.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no explanation of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage x402 showcase rather than a mature production API.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 97 via a single micropayment
- —Demonstrating x402 protocol payment flows on Base
- —Integrating pay-per-call APIs without API key management
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents that can settle USDC payments on Base automatically
- —Projects needing keyless, pay-as-you-go API access
Not for
- —Production workloads requiring documented request/response schemas
- —Users who need free or subscription-based API access
- —Anyone needing bulk or batch transaction receipt retrieval
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/97/receipt
# Returns 402 with x402 challenge; supply X-PAYMENT header with signed USDC payment on Base to access.Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response examples, and no explanation of what the receipt resource actually returns. Docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — all doc/pricing/API pages render only 'Connect wallet' with no content.
- —No OpenAPI or schema describing request parameters or response structure.
- —Unknown what the receipt payload actually contains; the endpoint path suggests a single fixed resource (transaction 97) rather than a general-purpose API.
- —Platform may be a demo or early-stage project; maturity is unclear.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/97/receipt
- —Platform advertises $0.02 per request, no API keys, no rate limits, across multiple API categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/97/receipt