Transaction receipt endpoint on Base, paid per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt lookup via the x402 payment protocol. The specific resource `/api/v1/transactions/100/receipt` returns receipt data for transaction ID 100 in JSON format, gated behind a per-request USDC micropayment on the Base network.
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.
The probed endpoint is live and returns a valid x402 challenge. It accepts USDC (contract 0x8335…2913) on Base with a maxAmountRequired of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). Payment is made via the `exact` scheme with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl — the docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no further content.
Capabilities
Use cases
- —Retrieving transaction receipt data via a single micropayment
- —Demonstrating x402 payment-gated API access patterns
- —Integrating pay-per-call endpoints into agent workflows without API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol integrations
- —Agents needing on-demand transaction receipt lookups without subscription overhead
- —Projects requiring keyless, pay-as-you-go API access on Base
Not for
- —High-volume batch transaction lookups where per-call pricing is inefficient
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/100/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 and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no example payloads, and the docs/pricing/API pages are all empty beyond a wallet-connect prompt. The specific purpose of this particular endpoint (transaction receipt for ID 100) is narrow and undocumented.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —Docs, pricing, and API pages render only 'Connect wallet' with no substantive content
- —The endpoint path includes a hardcoded transaction ID (100); it is unclear how to query other transactions
- —No example request or response bodies are documented anywhere
- —The platform lists many API categories but none have visible documentation or proof of functionality
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/100/receipt
- —All endpoints are priced at $0.02 per request 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
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/transactions/100/receipt