x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 73) behind an x402 paywall. It is part of a broader platform that offers multiple pay-per-request API categories including 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/73/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the payment details (asset: USDC on Base, amount: 20,000 base units = $0.02, payTo address provided). Once the caller submits a valid X-PAYMENT header with a signed payment, the endpoint returns the receipt data. No API keys or rate limits are advertised; access is purely payment-gated.
The platform's documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve but contain only a "Connect wallet" prompt with no further technical documentation. As a result, the exact schema of the receipt response and the semantics of "transaction 73" are unknown. The broader site lists many other endpoints (sentiment analysis, text summarization, geocoding, etc.) at the same $0.02 price point, but no OpenAPI spec or detailed docs were found for any of them.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 73 via a single micropayment
- —Demonstrating x402 protocol integration for pay-per-request APIs
- —Programmatic access to receipt data without API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents needing one-shot paid API access without subscriptions
- —Projects that want keyless, pay-as-you-go API consumption
Not for
- —Users needing detailed API documentation or response schemas before integrating
- —Bulk or high-volume receipt retrieval (no documented batch support)
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/73/receipt
# Returns 402 with x402 challenge. Include a signed X-PAYMENT header to complete payment and receive the receipt.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no response schema, no documentation beyond a wallet-connect prompt, and the purpose of 'transaction 73 receipt' is unexplained. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — response format is unknown
- —All documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt with no technical content
- —The specific meaning of 'transactions/73/receipt' is unclear — it may be a demo or placeholder resource
- —The broader platform lists many endpoints but none have documented schemas or examples
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/73/receipt
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages resolve but contain only a Connect wallet prompthttps://lowpaymentfee.com/docs