x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com exposes a card-transactions resource at `/api/v1/cards/34/transactions` behind an x402 payment challenge. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint probed (`/api/v1/cards/34/transactions`) accepts POST requests and returns `application/json`. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 USD. Payment is made via the x402 "exact" scheme to the payTo address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a timeout of 300 seconds.
Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The endpoint name suggests it deals with card transaction data (possibly financial card transactions), but the exact request body format and response structure are unknown. The platform advertises no API keys, no rate limits, and instant access, relying entirely on per-request x402 micropayments for access control.
Capabilities
Use cases
- —Retrieving card transaction records programmatically via micropayment
- —Integrating card transaction data into automated agent workflows without API key management
- —Querying financial transaction data with per-call USDC payments on Base
Fit
Best for
- —Agents or services that need on-demand card transaction data without subscription commitments
- —Developers experimenting with x402 payment-gated APIs on Base
- —Low-volume or sporadic access to card transaction endpoints
Not for
- —High-volume production use cases where $0.02/request adds up significantly
- —Users who need detailed API documentation or guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/cards/34/transactions \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty. The purpose of this specific endpoint (card/34/transactions) is unclear beyond its URL path. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
- —No OpenAPI or request/response schema provided; request body format and response structure are completely unknown
- —The meaning of 'cards/34/transactions' is unclear — it may be a demo or placeholder resource
- —The broader platform lists many endpoints but none have documented schemas or examples
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/cards/34/transactions
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/cards/34/transactions
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com