Transaction receipt endpoint on Base, paid per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource ID 348) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of 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 with no API keys or rate limits required.
The specific endpoint `/api/v1/transactions/348/receipt` returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme by including an X-PAYMENT header. The response MIME type is application/json. The endpoint accepts POST requests and is marked as discoverable.
Documentation on the site is extremely thin — the /docs, /pricing, /api, 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 usage examples. The platform appears to be a demonstration or early-stage x402 API marketplace, but the actual data returned by this receipt endpoint is unspecified.
Capabilities
Use cases
- —Retrieving a transaction receipt for record ID 348 via micropayment
- —Demonstrating x402 payment protocol integration on Base
- —Agent-driven pay-per-call data retrieval without API key management
Fit
Best for
- —Developers experimenting with x402 protocol payments
- —Agents needing keyless, pay-per-call API access on Base
- —Projects requiring USDC-settled micropayment endpoints
Not for
- —Production workloads requiring documented request/response schemas
- —Bulk data retrieval where per-call pricing is inefficient
- —Users who need fiat payment rails or non-crypto settlement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/348/receipt \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The /docs and other pages render only a wallet-connect prompt. The specific purpose of the 'transactions/348/receipt' resource is unexplained.
Warnings
- —No OpenAPI spec or schema documentation available
- —All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content
- —The specific data returned by this receipt endpoint is completely undocumented
- —Purpose of resource ID 348 is unclear — may be a demo or placeholder
- —Platform appears to be early-stage or a proof-of-concept
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/348/receipt
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/348/receipt