x402-gated transaction receipt endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a transaction receipt resource (transaction ID 79) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).
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 and crypto market data, 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 commitments — payment is handled entirely via x402 on Base.
However, this specific endpoint (/api/v1/transactions/79/receipt) is a single transaction receipt resource rather than one of the general-purpose APIs listed on the homepage. There is no OpenAPI schema, no documentation beyond the landing page, and the docs/pricing/API pages all render only a "Connect wallet" prompt with no further content. The actual response payload structure is unknown.
Capabilities
Use cases
- —Retrieving a receipt for transaction #79 via a single paid API call
- —Demonstrating x402 payment flow on Base with USDC
- —Agent-driven purchase of on-demand transaction data without API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents that need to fetch transaction receipts programmatically
- —Use cases requiring keyless, pay-per-request API access
Not for
- —Bulk retrieval of many transaction receipts (only one resource ID exposed)
- —Users who need detailed API documentation or response schema guarantees
- —Production workloads requiring SLA or rate-limit guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/79/receipt \
-H "X-PAYMENT: <x402_payment_token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (returns 402 with a valid x402 challenge), but there is no OpenAPI schema, no documentation, no example responses, and the docs/pricing pages are empty beyond a wallet-connect prompt. The specific resource (/transactions/79/receipt) is narrow and not listed among the advertised APIs. Effectively a stub with minimal verifiable information.
Warnings
- —No OpenAPI or response schema available — response payload structure is unknown
- —Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no content
- —This endpoint serves a single transaction receipt (ID 79); it is unclear if other transaction IDs are available
- —The advertised suite of APIs (analytics, AI, finance, utils) are separate endpoints not covered by this listing
- —No rate limit or SLA information provided
Citations
- —The endpoint returns a 402 challenge with x402Version 1, requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/transactions/79/receipt
- —maxAmountRequired is 20000 base units of USDC (6 decimals), equaling $0.02 per requesthttps://lowpaymentfee.com/api/v1/transactions/79/receipt
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Basehttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/79/receipt