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 107) 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 and settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/107/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header containing a signed payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the merchant address `0x1A2B…85F3`. The payment scheme is "exact" with a 300-second timeout window. No API keys or rate limits are advertised; access is gated purely by micropayment.
Documentation on the site is extremely thin — 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 usage examples available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual content and structure of the receipt response are unknown.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 107 via micropayment
- —Programmatic access to receipt data without API key management
- —Agent-driven payment-gated data retrieval on Base
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents that need to fetch transaction receipts on-demand
- —Use cases requiring keyless, pay-per-call API access
Not for
- —Bulk retrieval of many transaction receipts (no batch endpoint documented)
- —Users who need detailed API documentation or response schemas before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/107/receipt
# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment (0.02 USD on Base) to access.Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual purpose of the receipt content is undocumented. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages only show 'Connect wallet'
- —No OpenAPI or output schema provided; response format is unknown
- —The specific endpoint is for a single transaction ID (107); unclear if other transaction IDs are available or how they are discovered
- —The broader platform advertises many API categories (AI, analytics, finance, utilities) but none have documented schemas
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/107/receipt
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/107/receipt