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 49) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call and settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/49/receipt` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base-unit USDC (i.e., $0.02 given USDC's 6 decimals) paid to address `0x1A2B...85F3` on Base. No API keys or rate limits are advertised; access is granted purely via the x402 payment header.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's `outputSchema`, and no examples of what the receipt payload actually contains. The platform lists many other endpoints on its landing page, but details about each are limited to a name and price. Users should expect to experiment or contact the provider for specifics on the response format.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction ID 49 via a single paid request
- —Demonstrating x402 payment-gated API access on Base
- —Integrating pay-per-request infrastructure into agent workflows without API key management
Fit
Best for
- —Developers exploring x402 protocol integrations
- —Agents that need keyless, pay-per-call API access on Base
- —Testing micropayment flows with USDC on Base
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —Bulk retrieval of many transaction receipts (no batch endpoint documented)
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/49/receipt \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response examples, and all doc pages render only 'Connect wallet'. The specific purpose of this receipt endpoint is unclear beyond its URL path.
Warnings
- —No OpenAPI or schema documentation available — response format is unknown
- —All documentation pages (docs, API, pricing, README) return only a 'Connect wallet' prompt with no content
- —The endpoint path references a specific transaction ID (49); it is unclear whether this is a generic pattern or a fixed resource
- —No information on error handling, response fields, or edge cases
Citations
- —The endpoint returns a 402 x402 challenge requiring 20000 base-unit USDC ($0.02) on Base networkhttps://lowpaymentfee.com/api/v1/transactions/49/receipt
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Basehttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/49/receipt
- —Documentation, API, pricing, and README pages all render only 'Connect wallet'https://lowpaymentfee.com/docs