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 220) 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 endpoints are priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint probed — /api/v1/transactions/220/receipt — returned a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 "exact" scheme to the specified payTo address. The endpoint accepts POST requests and returns application/json. No OpenAPI schema, detailed documentation, or example responses were found in the crawl; the docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no substantive content.
Because the crawled documentation is essentially empty beyond the landing page listing, the actual structure of request bodies and response payloads for this receipt endpoint is unknown. The platform appears to be a demonstration or early-stage x402 API marketplace. Users should be aware that there is no published schema, no usage examples, and no visible documentation beyond the homepage summary.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction ID 220 via a micropayment
- —Demonstrating x402 protocol payment flows on Base
- —Programmatic access to paid API endpoints without API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that can settle USDC payments on Base automatically
- —Use cases requiring keyless, pay-per-call API access
Not for
- —Production workloads requiring documented schemas and SLAs
- —Users who need free or subscription-based API access
- —Retrieving arbitrary transaction receipts (endpoint is scoped to ID 220)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/220/receipt
# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment to proceed.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation, no example requests or responses, and the crawled docs/pricing/API pages are all blank beyond a wallet-connect prompt. The purpose and response format of this specific receipt endpoint are unclear.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —Docs, pricing, and API pages render only 'Connect wallet' with no content
- —The endpoint is scoped to a single transaction ID (220); unclear if other IDs are available
- —Platform appears to be early-stage or a demo; no SLA or support information found
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 returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/transactions/220/receipt
- —Platform offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com