Pay-per-call transaction receipt endpoint on Base via x402, $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" transaction receipt resource via the x402 payment protocol. It is part of a broader platform offering multiple pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities—all priced at $0.02 per request settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/217/receipt` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an X-PAYMENT header containing a signed USDC payment of up to 20,000 base units ($0.02) to the specified payTo address. No API keys, rate limits, or upfront commitments are required—access is instant once payment is verified on-chain.
The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export, all at the same $0.02/request price point. Documentation pages exist but currently show only a "Connect wallet" prompt with no further technical detail.
Capabilities
Use cases
- —Retrieving transaction receipts programmatically with per-call payment
- —Integrating pay-as-you-go API access into agent workflows without pre-registration
- —Demonstrating x402 protocol payment flows on Base
Fit
Best for
- —Agents needing instant API access without API key provisioning
- —Developers exploring x402 micropayment protocol integrations
- —Low-volume or sporadic usage patterns where subscription pricing is wasteful
Not for
- —High-volume batch processing where per-call fees accumulate quickly
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Applications requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/217/receipt \
-H "X-PAYMENT: <signed-x402-payment-header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear, but there is no OpenAPI schema, no response examples, no request body documentation, and the docs pages are empty stubs. The specific purpose of 'transaction 217 receipt' is unexplained.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no technical content
- —No OpenAPI or schema describing request/response payloads
- —The specific resource '/transactions/217/receipt' is opaque—unclear what transaction 217 refers to or what the receipt contains
- —Platform appears to be a demo or early-stage project with placeholder endpoints
Citations
- —Endpoint returns 402 with x402 challenge requiring up to 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/217/receipt
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/217/receipt