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 (transaction ID 318) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call, settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/318/receipt` accepts POST requests and returns a JSON response upon valid x402 payment. The x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) paid to address 0x1A2B…85F3. The platform advertises no API keys, no rate limits, and instant access — payment is the only authentication mechanism.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The endpoint's purpose ("Premium API Access" / transaction receipt) is vague, and it is unclear what data the receipt returns or what input the POST body expects. The broader platform lists many endpoints across categories but provides no detailed documentation for any of them.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 318 via programmatic x402 payment
- —Demonstrating x402 protocol integration for pay-per-request APIs
- —Accessing paid API resources without API keys using on-chain USDC payments
Fit
Best for
- —Developers experimenting with x402 protocol payments
- —Agents that can settle USDC payments on Base
- —Use cases requiring keyless, pay-per-call API access
Not for
- —Production workloads requiring documented request/response schemas
- —Users who need free or fiat-settled API access
- —Anyone needing detailed documentation or SLA guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/318/receipt
# Returns 402 with x402 challenge; include X-PAYMENT header with valid USDC payment proof to receive the receipt.Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty stubs. The specific purpose of this receipt endpoint is unclear.
Warnings
- —No documentation available — all doc pages render only 'Connect wallet' with no content
- —No OpenAPI or schema definition; request body and response format are unknown
- —The specific endpoint is for a single transaction receipt (ID 318); unclear if this is a demo or production resource
- —No rate limit or SLA information provided
- —The broader platform lists many endpoints but none have documented schemas
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/transactions/318/receipt
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com