Pay-per-call transaction receipt endpoint on Base via x402, $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" receipt resource for transaction ID 119. It is part of a broader platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services—all settled via the x402 protocol on the Base network using USDC.
The specific endpoint `/api/v1/transactions/119/receipt` accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact scheme. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The platform advertises no API keys, no rate limits, and instant access—just pay per call.
Documentation beyond the landing page is extremely sparse; the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what data is returned.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 119 via programmatic payment
- —Demonstrating x402 protocol integration for pay-per-call services
- —Agent-driven purchase of structured transaction data without API keys
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing keyless, pay-as-you-go API access on Base
- —Use cases requiring no subscription or rate-limit constraints
Not for
- —Users needing detailed API documentation or response schema guarantees
- —High-volume batch retrieval where per-call pricing is inefficient
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/119/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 response schema, no examples. The purpose of this specific receipt endpoint (transaction 119) is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No OpenAPI or schema documentation available
- —All doc/pricing/README pages render only 'Connect wallet' with no content
- —The endpoint is for a specific transaction ID (119); unclear if this is a demo or a real resource
- —Response payload structure is completely undocumented
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/119/receipt
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/119/receipt