x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 114) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call, settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/114/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The x402 challenge specifies an "exact" scheme with a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The platform advertises no API keys, no rate limits, and instant access. However, documentation pages (docs, pricing, API reference) all resolve to minimal "Connect wallet" content, so there is no detailed schema documentation, request/response examples, or explanation of what data the receipt endpoint actually returns. The broader site lists many endpoints across categories but provides no deeper technical docs for any of them.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 114 via a single paid API call
- —Demonstrating x402 protocol integration for pay-per-request services
- —Programmatic access to receipt data without API key management
Fit
Best for
- —Developers experimenting with x402 protocol payments
- —Agents that need on-demand receipt retrieval with crypto micropayments
- —Use cases requiring keyless, pay-as-you-go API access on Base
Not for
- —Production workloads requiring detailed API documentation and SLAs
- —Users who need fiat payment options or cannot transact in USDC on Base
- —Bulk retrieval of many different transaction receipts (endpoint is scoped to transaction 114)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/114/receipt \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no documentation, no request/response schema, no examples, and the purpose of the receipt endpoint is unclear. The docs, pricing, and API pages all show only 'Connect wallet' with no useful content.
Warnings
- —No API documentation available — docs, pricing, and API pages all render only 'Connect wallet'
- —No request body schema or response schema documented for this endpoint
- —The endpoint is scoped to a single transaction ID (114); unclear if other transaction IDs are available
- —The broader platform lists many endpoints but none have detailed documentation
- —Purpose and contents of the 'receipt' response are unknown
Citations
- —The x402 challenge specifies maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeouthttps://lowpaymentfee.com/api/v1/transactions/114/receipt
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/114/receipt
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —Documentation pages resolve to minimal 'Connect wallet' contenthttps://lowpaymentfee.com/docs