x402-gated transaction receipt endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 149) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol — no API keys, no rate limits, no subscriptions.
The specific endpoint probed (`/api/v1/transactions/149/receipt`) returns a valid x402 challenge (HTTP 402) requesting up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a 300-second timeout. The response MIME type is `application/json`. The endpoint accepts POST requests and is marked as discoverable.
Documentation is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The platform's actual data sources and model providers are unknown.
Capabilities
Use cases
- —Retrieving transaction receipts programmatically with per-call USDC payment
- —Integrating pay-per-request APIs into agent workflows without API key management
- —Accessing financial or utility data behind x402 paywalls on Base
Fit
Best for
- —Agents or services that can settle x402 payments in USDC on Base
- —Developers wanting zero-commitment, pay-as-you-go API access
- —Workflows requiring no-signup, instant API access
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume use cases where per-request pricing at $0.02 may be costly
- —Users without USDC on the Base network
Quick start
# Send a POST with x402 payment header to retrieve the receipt
curl -X POST https://lowpaymentfee.com/api/v1/transactions/149/receipt \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The actual functionality behind 'Premium API Access' for transaction 149 is unclear. Effectively a stub listing.
Warnings
- —No OpenAPI spec or schema documentation available
- —Docs, API, pricing, and README pages all render only 'Connect wallet' with no useful content
- —The specific purpose of /api/v1/transactions/149/receipt is unclear — 'Premium API Access' is generic
- —No request body schema or response schema documented anywhere
- —Actual data sources and model providers behind the platform are unknown
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge requests maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base with 300-second timeouthttps://lowpaymentfee.com/api/v1/transactions/149/receipt
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com