x402-gated transaction receipt endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource `/api/v1/transactions/354/receipt`) behind an x402 paywall. The endpoint is live and returns a standard x402 challenge requiring payment in USDC on the Base network. The specific resource appears to be one receipt within a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services.
The x402 challenge specifies a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The platform advertises no API keys, no rate limits, and instant access — payment is handled entirely via the x402 protocol with USDC on Base.
The broader lowpaymentfee.com platform lists 16+ endpoints across four categories: 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 (geocoding, validation, conversion, generation). All are priced at $0.02/request. However, this specific listing is for the transaction receipt endpoint only, and no documentation or schema details were found for any of the endpoints beyond the x402 challenge metadata.
Capabilities
Use cases
- —Retrieving a transaction receipt via x402 micropayment
- —Programmatic access to receipt data without API key management
- —Agent-driven payment-gated data retrieval on Base
Fit
Best for
- —Agents that can settle x402 payments in USDC on Base
- —Use cases requiring keyless, pay-per-call API access
- —Developers exploring x402 protocol integrations
Not for
- —Users needing detailed API documentation or OpenAPI schemas before integrating
- —High-volume batch retrieval where per-call costs add up
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/354/receipt
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access the receipt.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation, no example request/response bodies, and the specific purpose of 'transaction 354 receipt' is unclear. The crawled docs/pricing/API pages all returned only 'Connect wallet' with no substantive content.
Warnings
- —No API documentation or OpenAPI schema available — endpoint behavior beyond the x402 challenge is unknown.
- —The specific resource '/api/v1/transactions/354/receipt' appears to be a single hardcoded transaction receipt; unclear if this generalizes to other transaction IDs.
- —All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no useful content.
- —No example request or response payloads are available to verify what data is actually returned after payment.
Citations
- —The x402 challenge requires 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equaling $0.02 per request.https://lowpaymentfee.com/api/v1/transactions/354/receipt
- —The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The site lists 16+ endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com