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 18) 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 gated via x402 micropayments on the Base network using USDC.
The specific endpoint `/api/v1/transactions/18/receipt` accepts POST requests and returns JSON. The x402 challenge indicates a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.
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 documentation, and no usage examples available. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body is expected or what the receipt response contains. The platform appears to be a demonstration or early-stage x402 API marketplace.
Capabilities
Use cases
- —Retrieving transaction receipts via micropayment-gated API calls
- —Demonstrating x402 protocol payment flows on Base network
- —Integrating pay-per-call APIs without API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless, pay-per-call API access on Base
- —Projects requiring USDC micropayment-gated endpoints
Not for
- —Production workloads requiring documented request/response schemas
- —Users who need detailed API documentation or SDKs
- —High-volume use cases where per-call pricing is inefficient
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/18/receipt \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of this 'transaction 18 receipt' endpoint is unclear. The listing is essentially a stub.
Warnings
- —No API documentation available — all doc pages render only 'Connect wallet'
- —No OpenAPI or schema definition found
- —Purpose of '/api/v1/transactions/18/receipt' is unclear — may be a demo or placeholder
- —No request body schema or response schema documented
- —Platform appears to be early-stage or a demonstration site
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/18/receipt
- —Platform advertises $0.02/request pricing across all endpoints with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/18/receipt
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com