x402-gated transaction receipt endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a specific transaction receipt (transaction ID 83) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments.
The specific endpoint probed — `/api/v1/transactions/83/receipt` — returned a valid x402 challenge with a `maxAmountRequired` of 20,000 base units of USDC (0x8335… on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 "exact" scheme to the specified payTo address. The endpoint accepts POST requests and returns application/json.
Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The nature of what the "transaction receipt" contains is not documented, making it difficult to assess the endpoint's practical utility without making a paid request.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 83 via a single paid API call
- —Demonstrating x402 payment protocol integration for agent-to-agent commerce
- —Testing micropayment flows on the Base L2 network
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing pay-per-call API access without API key management
- —Low-cost micropayment API consumption on Base
Not for
- —Production workloads requiring documented request/response schemas
- —Bulk data retrieval or high-throughput analytics
- —Users who need detailed API documentation before purchasing
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/83/receipt
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access 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 documentation, no OpenAPI spec, no request/response examples, and the purpose of this specific transaction receipt endpoint is unclear. The broader site lists many APIs but provides zero documentation beyond titles and prices.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or schema definition for request or response payloads
- —The specific purpose and contents of the transaction 83 receipt are undocumented
- —Cannot verify what data is actually returned without making a paid request
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/83/receipt
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/83/receipt