Transaction receipt endpoint on Base, paid per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a transaction receipt (transaction ID 85) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of 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 or rate limits required.
The specific endpoint `/api/v1/transactions/85/receipt` returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per call. Payment is made via the x402 exact scheme by including an X-PAYMENT header. The response MIME type is application/json. The endpoint accepts POST requests and is marked as discoverable.
Documentation beyond the landing page 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 example payloads available. The actual content returned by this receipt endpoint (field names, structure) is unknown. The platform appears to be a demonstration or early-stage x402 API marketplace rather than a mature production service.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 85 via programmatic x402 payment
- —Demonstrating x402 protocol integration with USDC on Base
- —Agent-driven per-call API access without API key management
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-per-call API access on Base
- —Testing USDC micropayment flows
Not for
- —Production workloads requiring documented request/response schemas
- —Bulk or high-volume data retrieval (no batch endpoints documented)
- —Users who need fiat-only payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/85/receipt
# Returns 402 with x402 challenge. Include X-PAYMENT header with signed USDC payment to proceed.Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect prompt. The specific purpose of this receipt endpoint is unclear, and the broader platform appears to be a demo or early-stage project.
Warnings
- —No OpenAPI or schema documentation available — request body and response structure are completely unknown
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
- —This is a single transaction-specific receipt endpoint (transaction 85); unclear if it generalizes
- —Platform appears to be early-stage or a demonstration; production readiness is uncertain
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)https://lowpaymentfee.com/api/v1/transactions/85/receipt
- —All APIs 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 Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categorieshttps://lowpaymentfee.com
- —Documentation pages render only a 'Connect wallet' prompt with no technical contenthttps://lowpaymentfee.com/docs