x402-gated card-transaction endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com exposes a card transactions resource at `/api/v1/cards/62/transactions` behind the x402 payment protocol. When called without payment, it returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on the Base network. Payment is settled on-chain to the specified wallet address using the "exact" scheme.
The parent site lowpaymentfee.com advertises a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/crypto market data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific endpoint being listed here (`/api/v1/cards/62/transactions`) is not prominently documented on the site's landing page, and its exact input/output schema is not published. The endpoint accepts HTTP POST and returns `application/json`.
Because there is no OpenAPI spec, no request/response examples, and no dedicated documentation for this particular resource, the actual functionality behind "card 62 transactions" is unclear. It may relate to the finance category or could be a generic placeholder. The crawled docs, pricing, API, and README pages all rendered only a wallet-connect prompt with no additional content. Prospective callers should treat this as a minimally documented endpoint until further details surface.
Capabilities
Use cases
- —Retrieving transaction records for a specific card via a single paid API call
- —Programmatic access to card transaction data without API key registration
- —Agent-driven financial data retrieval with on-chain USDC settlement
Fit
Best for
- —Developers wanting keyless, pay-per-use card transaction data
- —AI agents that can settle x402 USDC payments on Base
- —Prototyping micropayment-gated financial APIs
Not for
- —Users needing well-documented, schema-validated endpoints
- —High-volume batch transaction queries where per-call pricing is inefficient
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/cards/62/transactions
# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation for this specific resource, and the crawled doc pages are empty. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The specific resource /api/v1/cards/62/transactions is not listed on the provider's landing page catalog
- —All documentation pages (docs, api, pricing, README) returned only a wallet-connect prompt with no content
- —Input and output schemas are unknown — callers cannot determine what request body to send or what response to expect
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/cards/62/transactions
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/cards/62/transactions
- —All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com