x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt resource (specifically for transaction ID 130) behind an x402 paywall. The site advertises itself as a platform hosting multiple pay-per-call API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/transactions/130/receipt` is labeled "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) using the "exact" payment scheme. Payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.
Note that while the landing page lists many endpoint categories (sentiment analysis, summarization, embeddings, price feeds, geocoding, etc.), the crawled documentation pages returned only "Connect wallet" with no actual API documentation, schemas, or example payloads. It is unclear what data the receipt endpoint actually returns, and the broader platform's endpoints have not been independently verified. The lack of documentation makes it difficult to assess the real utility of this specific endpoint or the platform as a whole.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 130 via a micropayment-gated call
- —Demonstrating x402 protocol payment flows on Base
- —Agent-driven pay-per-use API consumption without API keys
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-per-call API access on Base
- —Testing USDC micropayment integrations
Not for
- —Production workloads requiring documented schemas and SLAs
- —Bulk data retrieval or high-throughput analytics
- —Users who need detailed API documentation before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/130/receipt
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment proof to receive the receipt.Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation, no request/response schema, and no examples. The endpoint path suggests a single static resource (transaction 130 receipt) rather than a general-purpose API. The broader platform lists many endpoints but none are documented beyond titles.
Warnings
- —No API documentation available — all doc/pricing/README pages return only 'Connect wallet'
- —No request or response schema provided for this or any endpoint on the platform
- —The endpoint path is hardcoded to transaction ID 130; unclear if this is parameterizable
- —The platform lists many endpoint categories but none have been verified to actually function
- —Purpose and content of the 'receipt' response is unknown
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (=$0.02)https://lowpaymentfee.com/api/v1/transactions/130/receipt
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/130/receipt
- —All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categorieshttps://lowpaymentfee.com