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 via the x402 payment protocol. The specific path `/api/v1/transactions/259/receipt` returns a receipt for transaction 259 in JSON format, gated behind a per-call USDC micropayment on the Base network. The x402 challenge confirms the endpoint is live and accepts exact-scheme payments of up to 20,000 base units of USDC (0.02 USD) per request, settled to address 0x1A2B…85F3.
The broader lowpaymentfee.com platform advertises a wide catalog of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, 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 minimum commitments. However, only the transaction receipt endpoint was probed and confirmed live in this listing.
Documentation on the site is extremely thin — 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 usage examples available from the crawl. The endpoint's outputSchema indicates it accepts HTTP POST and is discoverable, but the actual request body format and response structure are unknown.
Capabilities
Use cases
- —Retrieving a receipt for a specific transaction via micropayment
- —Demonstrating x402 payment protocol integration for agent-to-agent commerce
- —Accessing pay-per-call APIs without API key registration
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing on-demand transaction receipts without subscription
- —Projects requiring keyless, pay-per-use API access on Base
Not for
- —Production workloads requiring documented request/response schemas
- —Bulk retrieval of many transaction receipts (no batch endpoint documented)
- —Users who need fiat-only payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/259/receipt \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge with clear pricing (0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and the site's documentation pages are all empty beyond a wallet-connect prompt. The specific purpose of this receipt endpoint is unclear beyond its URL path. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available from the provider
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
- —Request body format and response structure are completely undocumented
- —Only this specific receipt endpoint was probed; the broader API catalog is unverified
- —The endpoint path references a specific transaction ID (259), suggesting it may be a single-resource endpoint rather than a general-purpose API
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/259/receipt
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/259/receipt
- —All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com