x402-gated transaction receipt endpoint on Base, priced at $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt resource via the x402 payment protocol. The specific path `/api/v1/transactions/42/receipt` returns a receipt for transaction ID 42 in JSON format, gated behind a per-request USDC micropayment on the Base network. The x402 challenge confirms the endpoint is live and accepts exact-scheme payments of up to 20,000 base units of USDC (0.02 USD) per call, with a 300-second payment timeout.
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required. Payments settle in USDC on the Base L2 network.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the transaction receipt actually contains. The endpoint's specific purpose (returning a receipt for a hardcoded transaction ID 42) is unclear and may be a demo or placeholder rather than a production resource.
Capabilities
Use cases
- —Retrieving a transaction receipt for a specific transaction ID via micropayment
- —Demonstrating x402 payment protocol integration on Base
- —Agent-initiated pay-per-call data retrieval without API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless, pay-per-request API access
- —Testing micropayment flows on Base L2
Not for
- —Production workloads requiring documented request/response schemas
- —Bulk transaction receipt retrieval (hardcoded transaction ID 42)
- —Users who need detailed API documentation before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/42/receipt
# Returns 402 with x402 payment challenge.
# Include X-PAYMENT header with a valid USDC payment proof on Base to receive the receipt.Endpoint
Quality
The x402 challenge is live and confirms pricing and network details, but documentation is essentially nonexistent (all doc pages show only 'Connect wallet'). No OpenAPI schema, no request/response examples, and the hardcoded transaction ID 42 in the path suggests this may be a demo endpoint rather than a general-purpose API. The broader platform lists many endpoints but provides no technical detail for any of them.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content
- —No OpenAPI or schema available for request or response formats
- —The endpoint path contains a hardcoded transaction ID (42), suggesting it may be a demo or placeholder
- —No information on what the transaction receipt actually contains
- —The platform lists many API categories but none have documented schemas or examples
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network with a 300-second timeouthttps://lowpaymentfee.com/api/v1/transactions/42/receipt
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform advertises APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages render only a 'Connect wallet' prompt with no technical contenthttps://lowpaymentfee.com/docs