x402-gated transaction receipt endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a transaction receipt resource (transaction ID 210) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).
The broader lowpaymentfee.com platform advertises a suite of 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. However, this specific listing is for the `/api/v1/transactions/210/receipt` endpoint only.
Documentation 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 usage examples available from the crawled material. The endpoint is confirmed live (returns a valid x402 402 challenge), but the actual response payload structure after successful payment is unknown.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 210 via programmatic payment
- —Demonstrating x402 protocol integration for agent-to-agent micropayments
- —Building payment-gated data retrieval workflows on Base
Fit
Best for
- —Developers experimenting with x402 protocol payments
- —Agents that need to fetch transaction receipts via micropayment
- —Projects already operating on the Base L2 network with USDC
Not for
- —Users needing comprehensive API documentation before integrating
- —Production systems requiring well-documented request/response schemas
- —Users who need free or fiat-only payment options
Quick start
# Endpoint requires x402 payment header (USDC on Base)
curl -X POST https://lowpaymentfee.com/api/v1/transactions/210/receipt
# Returns 402 with x402 challenge; attach X-PAYMENT header after settling $0.02 USDCEndpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing and network details. However, documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples. The specific purpose of this receipt endpoint (transaction 210) is unclear, and the broader platform docs pages are empty beyond a wallet-connect prompt.
Warnings
- —No OpenAPI or schema documentation available for request or response payloads
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
- —The specific endpoint path references a hardcoded transaction ID (210); unclear if this is a demo or a real resource
- —No information on what the receipt response contains after successful payment
Citations
- —The endpoint returns a 402 challenge with x402Version 1, requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/transactions/210/receipt
- —maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals = $0.02)https://lowpaymentfee.com/api/v1/transactions/210/receipt
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages render only a 'Connect wallet' prompt with no technical contenthttps://lowpaymentfee.com/docs