x402-gated transaction receipt endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 103) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated via the x402 protocol on the Base network and settled in USDC.
The specific endpoint `/api/v1/transactions/103/receipt` accepts POST requests and returns `application/json`. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all its endpoints, with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the receipt resource actually contains or what input parameters the POST body expects. The endpoint is confirmed live (402 challenge returned), but the lack of documentation makes it difficult to use without experimentation.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 103 via a micropayment
- —Demonstrating x402 protocol integration for pay-per-call APIs
- —Agent-driven purchase of on-demand financial data
Fit
Best for
- —Developers experimenting with x402 protocol payments
- —Agents that need to fetch transaction receipts programmatically
- —Use cases requiring no-signup, pay-per-call API access
Not for
- —Production workloads requiring documented request/response schemas
- —Bulk retrieval of many transaction receipts (no batch endpoint documented)
- —Users who need detailed API documentation before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/103/receipt
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment proof to receive the receipt.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what the receipt contains or what POST body is expected. The listing is effectively a stub.
Warnings
- —No documentation available — all doc/pricing/API pages render only 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —Purpose of 'transaction 103 receipt' is unclear — may be a demo or placeholder resource
- —No information on what POST body parameters are expected
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/103/receipt
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/103/receipt
- —Docs, API, pricing, and README pages all show only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs