Pay-per-call transaction receipt endpoint on Base via x402, priced at $0.02 in USDC.
What it does
This x402-enabled endpoint at lowpaymentfee.com provides a "Premium API Access" receipt for transaction 324. It is part of a broader platform offering a variety of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/324/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers supply an X-PAYMENT header containing a signed USDC payment of up to 20,000 base units ($0.02, since USDC uses 6 decimals) 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, geocoding, validation, conversion, and more, all at the same $0.02 per-request price point. However, documentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 324 via a single paid API call
- —Demonstrating x402 pay-per-request patterns for agent-to-agent commerce
- —Accessing premium data endpoints without API key registration
Fit
Best for
- —Developers experimenting with x402 payment protocol integrations
- —AI agents that need keyless, pay-per-call API access on Base
- —Projects requiring on-chain micropayment-gated endpoints
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume batch processing where per-request fees add up quickly
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/324/receipt \
-H "X-PAYMENT: <x402-signed-payment-header>" \
-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 spec, no request/response schema, no documentation, and no examples. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. The specific purpose of this particular receipt endpoint is unclear beyond its generic title.
Warnings
- —No OpenAPI specification or request/response schema available
- —All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no content
- —The endpoint path references a specific transaction ID (324); it is unclear whether this is a generic pattern or a fixed resource
- —No examples of request body or response body are available from any source
- —The broader platform claims many endpoints but none have documented schemas
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/transactions/324/receipt
- —maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02https://lowpaymentfee.com/api/v1/transactions/324/receipt
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Basehttps://lowpaymentfee.com
- —Platform lists endpoints for analytics, AI, finance, and infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages returned only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs