Transaction receipt endpoint on Base, paid per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt for transaction ID 150 via a POST request, gated by the x402 payment protocol. It is part of a broader platform (lowpaymentfee.com) that offers a variety of 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/150/receipt` returns a JSON response upon successful 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), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B…85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through per-request micropayment.
Documentation on the site is extremely thin — the docs, API, pricing, 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 challenge's outputSchema stub, and no explanation of what the receipt payload contains. The platform appears to be a demonstration or early-stage deployment of x402-gated APIs rather than a mature production service.
Capabilities
Use cases
- —Retrieving a receipt for a specific transaction via micropayment
- —Demonstrating x402 protocol payment flows for API access
- —Integrating pay-per-call API access without API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-per-call API access on Base
- —Prototyping micropayment-gated API workflows
Not for
- —Production workloads requiring documented request/response schemas
- —Bulk or high-volume receipt retrieval (no batch endpoint visible)
- —Users who need fiat-only payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/150/receipt
# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to complete.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 the docs pages are empty. The purpose and contents of the receipt response are unknown, making this effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — response payload is unknown
- —All documentation pages (docs, API, pricing, README) return only a 'Connect wallet' prompt with no content
- —The endpoint path is hardcoded to transaction ID 150; it is unclear whether other IDs are supported or what the transaction refers to
- —Platform appears to be early-stage or a demo; reliability and longevity are uncertain
Citations
- —Endpoint returns 402 with x402 challenge, maxAmountRequired 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/150/receipt
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/150/receipt
- —Platform advertises $0.02 per request, no API keys, no rate limits, Base networkhttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no documentation contenthttps://lowpaymentfee.com/docs