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 106) 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 priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/106/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge specifying the USDC asset on Base (contract `0x8335…2913`), and must attach an `X-PAYMENT` header with a signed payment of up to 20,000 base units (i.e., $0.02 USDC, since USDC uses 6 decimals). No API keys or rate limits are advertised; access is purely pay-per-call.
The platform lists many other endpoints across analytics, AI inference (sentiment, summarization, classification, embeddings), finance (price feeds, exchange rates, token quotes, gas estimates), and utilities (geocoding, validation, conversion, generation), all at the same $0.02 price point. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain unverified.
Capabilities
Use cases
- —Retrieving a transaction receipt for transaction 106 via a micropayment
- —Demonstrating x402 protocol integration for pay-per-call APIs
- —Programmatic access to receipt data without API key management
Fit
Best for
- —Developers experimenting with x402 protocol payments
- —Agents that need on-demand receipt retrieval with crypto micropayments
- —Projects already operating on the Base L2 network with USDC
Not for
- —Users needing free or subscription-based API access
- —Production workloads requiring documented response schemas and SLAs
- —Users without a Base-compatible wallet or USDC holdings
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/106/receipt
# Returns 402 with x402 challenge. Attach X-PAYMENT header with signed USDC payment on Base to complete.Endpoint
Quality
The endpoint is live (returns a valid x402 402 challenge), but there is no documentation, no OpenAPI schema, no example responses, and the docs/pricing/README pages are all empty stubs showing only 'Connect wallet'. The purpose of this specific receipt endpoint is unclear beyond its URL path. The broader platform lists many endpoints but none are documented.
Warnings
- —All documentation pages (/docs, /pricing, /api, /README) returned no useful content — only 'Connect wallet' prompts.
- —No response schema or example output is available for this endpoint.
- —The specific purpose and data returned by /api/v1/transactions/106/receipt is undocumented and unclear.
- —The broader platform advertises many endpoint categories (AI, analytics, finance, utilities) but none have verifiable documentation or schemas.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/transactions/106/receipt
- —maxAmountRequired is 20000 base units of USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equating to $0.02https://lowpaymentfee.com/api/v1/transactions/106/receipt
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Platform lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages returned only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs