Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This x402-enabled endpoint at lowpaymentfee.com provides access to a transaction receipt resource (transaction ID 378) via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact payment scheme. The price per call is $0.02 (20,000 base units of USDC with 6 decimals).
The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.
However, this specific endpoint (/api/v1/transactions/378/receipt) is not listed among the advertised API categories on the landing page, and no documentation, request schema, or response schema is available. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. The actual behavior and output of this endpoint remain unclear beyond the x402 challenge metadata.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 378 via a paid API call
- —Demonstrating x402 payment-gated API access on the Base network
- —Integrating pay-per-call USDC micropayments into agent workflows
Fit
Best for
- —Developers experimenting with x402 payment protocols
- —Agents needing pay-per-call access without API key management
- —Use cases requiring USDC-settled micropayments on Base
Not for
- —Production workloads requiring documented request/response schemas
- —Users who need free or subscription-based API access
- —Applications requiring high-throughput or bulk transaction receipt retrieval
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/378/receipt
# Returns 402 with x402 payment challenge; include X-PAYMENT header with valid USDC payment proof to access the resource.Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no request/response schema, and no explanation of what the transaction receipt contains. The docs pages are empty. The specific endpoint path (/transactions/378/receipt) is not listed among the site's advertised APIs, making its purpose unclear.
Warnings
- —No request or response schema available — actual output is unknown
- —This specific endpoint (/api/v1/transactions/378/receipt) is not listed among the site's advertised API categories
- —All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no content
- —The hardcoded transaction ID (378) in the path suggests this may be a single-resource endpoint rather than a general-purpose API
Citations
- —The endpoint returns a 402 x402 challenge with USDC on Base network, maxAmountRequired 20000 base unitshttps://lowpaymentfee.com/api/v1/transactions/378/receipt
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/378/receipt
- —Documentation, API, pricing, and README pages show only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs