x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per call.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt resource at `/api/v1/transactions/116/receipt`. It is part of a broader platform that offers a variety of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.
The specific endpoint probed (`/api/v1/transactions/116/receipt`) returned a live 402 challenge with x402 version 1, requesting payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) to address 0x1A2B…85F3. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.
Documentation beyond the landing page 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 actual data returned by this receipt endpoint is unknown — the description "Premium API Access" is generic and does not clarify what the receipt contains. The platform appears to be a demonstration or early-stage deployment of x402-gated microservices.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction ID 116 via a single micropayment
- —Demonstrating x402 protocol payment flows for agent-to-API commerce
- —Integrating pay-per-call receipt lookups into automated financial workflows
Fit
Best for
- —Developers experimenting with x402 protocol integrations
- —Agents that need on-demand transaction receipts without API key management
- —Low-volume, pay-as-you-go access to receipt data
Not for
- —High-volume bulk receipt retrieval (no documented batch endpoints)
- —Users needing detailed API documentation or guaranteed SLAs
- —Anyone requiring non-USDC or non-Base-network payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/116/receipt \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and the /docs page is empty. The purpose of this specific receipt endpoint is unclear beyond its generic 'Premium API Access' label.
Warnings
- —No API documentation available; /docs, /api, /pricing, and /README pages all show only 'Connect wallet'
- —No OpenAPI or schema definition found for request or response payloads
- —The specific data returned by this receipt endpoint is undocumented
- —The endpoint path includes a hardcoded transaction ID (116), suggesting it may be a single-resource demo rather than a parameterized API
- —Platform appears to be early-stage or a demonstration site
Citations
- —The endpoint returns a 402 challenge with x402 version 1, scheme 'exact', network 'base', maxAmountRequired 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/transactions/116/receipt
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com