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/6/receipt` is labeled "Premium API Access" and accepts POST requests, returning application/json responses. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals). No API keys or rate limits are required; access is granted per-request via the x402 payment header.
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs across several categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with the same pay-per-use model on the Base network.
Documentation is extremely sparse — 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 example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual data returned after payment is unknown from the available material.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction ID 6 via paid API call
- —Programmatic access to premium data without API key management
- —Agent-driven micropayment workflows on Base using USDC
Fit
Best for
- —Developers experimenting with x402 payment protocol integrations
- —Agents that need keyless, pay-per-request API access on Base
- —Use cases requiring low-cost ($0.02) per-call transaction data
Not for
- —Users needing detailed API documentation or request/response schemas before integrating
- —High-volume batch processing where per-request fees add up without volume discounts
- —Anyone requiring non-USDC or non-Base payment settlement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/6/receipt \
-H "X-PAYMENT: <x402_payment_token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific receipt endpoint is unclear beyond its label. The broader platform lists many endpoints but provides no technical details for any of them.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet' with no content.
- —No OpenAPI or schema definition found for any endpoint on the platform.
- —The specific resource '/api/v1/transactions/6/receipt' has a hardcoded transaction ID (6); it is unclear whether this is a demo or a real parameterized endpoint.
- —Response format and fields are completely unknown — no examples or schema provided.
- —The platform lists many API categories (AI, Finance, etc.) but none have verifiable documentation or confirmed functionality.
Citations
- —Endpoint returns 402 with x402 challenge, maxAmountRequired 20000 in USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/6/receipt
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/6/receipt
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs