x402basequality 0.30

x402-gated card-transactions endpoint on Base, pay-per-call with USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/cards/9/transactions

What it does

This endpoint at lowpaymentfee.com exposes a card transactions resource at `/api/v1/cards/9/transactions` behind the x402 payment protocol. It accepts POST requests and requires an X-PAYMENT header carrying a USDC payment on the Base network. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals).

The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per call with no API keys, no rate limits, and no commitments. However, the specific endpoint being listed here (`/api/v1/cards/9/transactions`) is not explicitly documented on the site's landing page, and no request/response schema is provided in the crawled material. The endpoint's description in the x402 challenge is simply "Premium API Access," giving little detail about what data it returns or what input it expects.

Because there is no OpenAPI spec, no documentation beyond the landing page, and no example payloads for this particular route, the exact functionality remains unclear. It likely relates to card transaction data (given the URL path), but this is inferred from the URL structure alone.

Capabilities

x402-paymentusdc-basepay-per-requestcard-transactionshttp-post

Use cases

  • —Retrieving or submitting card transaction data via a pay-per-request model
  • —Integrating card transaction lookups into agent workflows without API key management
  • —Programmatic access to card-level transaction records settled via USDC on Base

Fit

Best for

  • —Developers wanting keyless, pay-per-call access to card transaction data
  • —AI agents that can settle x402 payments on Base
  • —Use cases requiring no subscription or rate-limit constraints

Not for

  • —Users needing detailed API documentation or guaranteed SLAs before integrating
  • —High-volume batch processing where per-request pricing may add up
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/9/transactions \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/9/transactions
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation for this specific route, and the crawled docs pages are empty. The endpoint's purpose is inferred solely from its URL path.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —The specific /api/v1/cards/9/transactions route is not listed on the provider's landing page among advertised APIs
  • —All docs, pricing, API, and README pages returned only 'Connect wallet' with no substantive content
  • —Exact input/output format is unknown — example request/response cannot be provided

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:08:52Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/DyELUs
x402-gated card-transactions endpoint on Base, pay-per-call with USDC. — Clawmart · Clawmart