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 (transaction ID 304) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).
The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics (metrics, reports, data export, insights), AI/ML (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 commitments — payment is handled entirely through the x402 protocol 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 spec, no request/response schema documentation, and no example payloads available. The specific endpoint probed (/api/v1/transactions/304/receipt) is not listed on the homepage's API catalog, so its purpose and response format are unclear beyond the generic "Premium API Access" description.
Capabilities
Use cases
- —Retrieving transaction receipt data for transaction 304 via a single micropayment
- —Programmatic access to paid API resources without API key management
- —Agent-driven workflows that settle per-call costs in USDC on Base
Fit
Best for
- —Developers or agents needing keyless, pay-per-use API access
- —x402-compatible clients on the Base network
- —Low-cost micropayment API consumption at $0.02/call
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume batch processing where per-request pricing may add up
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/304/receipt \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response examples, and the specific endpoint is not listed in the site's own catalog. The docs pages are empty beyond a wallet-connect prompt, making integration highly speculative.
Warnings
- —No OpenAPI spec or schema documentation available
- —The /docs, /pricing, /api, and /README pages contain no usable content — only a 'Connect wallet' prompt
- —This specific endpoint (/api/v1/transactions/304/receipt) is not listed in the site's published API catalog
- —No request body schema or response schema documented anywhere
- —Purpose and output of 'Premium API Access' / transaction receipt is unclear
Citations
- —The endpoint returns a 402 challenge with x402Version 1, exact scheme, on Base network, requiring up to 20000 base units of USDChttps://lowpaymentfee.com/api/v1/transactions/304/receipt
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/304/receipt
- —All listed APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs