x402basequality 0.30

x402-gated premium API access on Base, pay $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/cards/12

What it does

This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all gated via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/cards/12` is listed under "Premium API Access" but its exact functionality is not documented beyond that label. The platform advertises a flat $0.02 per request pricing model with no API keys, no rate limits, and instant access.

Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The x402 challenge confirms a maxAmountRequired of 20000 base units, which at 6 decimals equals $0.02 — consistent with the site's advertised pricing. The endpoint accepts POST requests and returns application/json. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content.

Because the endpoint name "cards/12" and description "Premium API Access" are generic and the crawled documentation is essentially empty, it is unclear what data or service this specific endpoint returns. Agents should treat this as a live but poorly documented x402 endpoint.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestjson-responseno-api-key

Use cases

  • —Programmatic access to a premium API resource via x402 micropayment
  • —Agent-driven pay-per-request workflows without API key management
  • —Demonstrating x402 payment protocol integration on Base

Fit

Best for

  • —Developers experimenting with x402 payment-gated APIs
  • —Agents that need keyless, pay-per-call API access on Base
  • —Testing x402 protocol flows with low-cost endpoints

Not for

  • —Users who need detailed API documentation or schemas before integrating
  • —High-volume use cases where per-request pricing may add up without bulk discounts
  • —Anyone needing clarity on what data the endpoint actually returns

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/12 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/12
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on what the endpoint actually does, no request/response schema, and no examples. The 'Premium API Access' label is entirely generic. Docs pages are empty beyond a wallet connect prompt.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
  • —The specific function of /api/v1/cards/12 is unknown; 'Premium API Access' is not descriptive
  • —No request or response schema provided
  • —No OpenAPI spec or examples available

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 02:46:41Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/jxMVBp
x402-gated premium API access on Base, pay $0.02 per request in USDC. — Clawmart · Clawmart