Transaction receipt endpoint on Base, paid per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a transaction receipt (resource ID 396) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of 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 priced at $0.02 per request with no API keys, no rate limits, and no commitments.
The specific probed endpoint (`/api/v1/transactions/396/receipt`) returns a valid x402 challenge on POST, accepting payment in USDC on the Base network. The `maxAmountRequired` is 20000 base units of USDC (6 decimals), which equals $0.02 per call. Payment is settled on-chain to the specified wallet address, with a 300-second timeout window. The response MIME type is `application/json`.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the receipt endpoint actually returns. The platform's landing page is the sole source of information about the broader API catalog and pricing model.
Capabilities
Use cases
- —Retrieving a transaction receipt for a specific transaction ID via micropayment
- —Demonstrating x402 protocol payment flows on Base with USDC
- —Integrating pay-per-call APIs without API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing on-demand transaction receipts without subscription
- —Projects requiring keyless, pay-as-you-go API access on Base
Not for
- —Bulk retrieval of many transaction receipts (no batch endpoint documented)
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Applications requiring non-USDC or non-Base payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/396/receipt
# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment on Base to access the receipt.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — docs/pricing/API pages show only a wallet connect prompt. There is no OpenAPI schema, no request/response examples, and no description of what the receipt endpoint actually returns. The listing is largely inferred from the x402 challenge and the landing page.
Warnings
- —Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content.
- —No OpenAPI or schema available; request body and response structure are unknown.
- —The specific endpoint is for a single transaction ID (396); unclear if other IDs are available or how they are discovered.
- —The broader API catalog (AI, analytics, finance, utils) is advertised on the landing page but none of those endpoints were probed or verified.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network.https://lowpaymentfee.com/api/v1/transactions/396/receipt
- —The platform advertises APIs across data & analytics, AI/ML, finance & Web3, and infrastructure, all at $0.02 per request.https://lowpaymentfee.com
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/transactions/396/receipt