x402-gated card transaction endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides access to card transaction data for card ID 82 via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network.
The specific endpoint `/api/v1/cards/82/transactions` accepts POST requests and charges a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call. Payment is settled on-chain via the x402 "exact" scheme with no API keys, no rate limits, and no subscriptions required. The x402 challenge was successfully captured, confirming the endpoint is live.
Documentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the transactions endpoint accepts or returns. The endpoint's purpose (card transaction data) is inferred solely from the URL path and the generic "Premium API Access" label. Prospective users should expect to experiment with the POST body to discover the actual input/output contract.
Capabilities
Use cases
- —Retrieving transaction history for a specific card
- —Programmatic access to card transaction records without API key management
- —Agent-driven financial data retrieval with on-chain micropayments
Fit
Best for
- —Developers who want keyless, pay-per-call access to card transaction data
- —AI agents that can settle x402 payments on Base in USDC
- —Users who prefer no-subscription, usage-based pricing
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Applications requiring bulk/batch transaction exports at low marginal cost
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/cards/82/transactions \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and confirms pricing and network, but there is zero documentation on request/response schemas, no OpenAPI spec, and the docs pages are empty. The endpoint's actual functionality is unclear beyond the URL path name.
Warnings
- —No OpenAPI or schema documentation available — input/output contract is unknown
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content
- —The specific purpose of /api/v1/cards/82/transactions is inferred from the URL path only; no description exists
- —Card ID 82 is hardcoded in the path — unclear if other card IDs are available or what they represent
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/cards/82/transactions
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/cards/82/transactions