Pay-per-call transaction receipt endpoint on Base via x402, $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" receipt resource for transaction ID 74. It is part of a broader platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities—all priced at $0.02 per request and settled in USDC on the Base network via the x402 protocol.
The specific endpoint `/api/v1/transactions/74/receipt` accepts POST requests and returns JSON. Payment is handled inline: callers must include an X-PAYMENT header satisfying the x402 challenge (scheme: exact, asset: USDC on Base, amount: 20000 base units = $0.02). No API keys, rate limits, or upfront commitments are required—access is instant once payment is verified.
The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more, all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (pages return only a "Connect wallet" prompt), so the actual data returned by this receipt endpoint and the broader API surface is not well-documented.
Capabilities
Use cases
- —Retrieving a transaction receipt after a payment event
- —Programmatic proof-of-payment retrieval for on-chain transactions
- —Agent-driven access to premium data without API key management
Fit
Best for
- —Developers wanting zero-setup pay-per-call API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or SDKs before integrating
- —High-volume batch processing where per-call fees add up quickly
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/74/receipt \
-H "X-PAYMENT: <x402_payment_token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response body, and all documentation pages return only 'Connect wallet'. The specific purpose of this receipt endpoint beyond its name is unknown.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no actual content.
- —No request or response schema is documented—actual payload structure is unknown.
- —The endpoint path references a specific transaction ID (74); unclear if this is a demo or a real resource.
- —Platform appears to be a generic demo or early-stage project with many advertised endpoints but no verifiable documentation.
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/74/receipt
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/74/receipt