x402basequality 0.25

x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/cards/39

What it does

lowpaymentfee.com is an x402 protocol API marketplace that gates a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/39` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 `X-PAYMENT` header with the "exact" scheme — no API keys, accounts, or rate limits are required.

The broader platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02 per request price point.

Note that the specific functionality behind `/api/v1/cards/39` is not documented beyond the generic "Premium API Access" label. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and README pages all resolve to a minimal "Connect wallet" prompt with no additional content. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it impossible to determine what data or service this particular card returns.

Capabilities

x402-paymentusdc-baseper-request-micropaymentno-api-keyno-rate-limitjson-response

Use cases

  • —Accessing gated API endpoints without creating an account or managing API keys
  • —Making one-off paid API calls from autonomous agents using x402 protocol
  • —Paying per-request for data, AI inference, or utility services via USDC on Base

Fit

Best for

  • —Developers or agents that want keyless, pay-as-you-go API access
  • —x402-compatible wallets and agent frameworks on Base
  • —Low-volume or sporadic API consumers who prefer no subscriptions

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before purchasing
  • —High-volume consumers who need bulk pricing or rate-limit guarantees
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/39 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/39
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is confirmed live with a valid 402 challenge, but there is zero documentation on what /api/v1/cards/39 actually returns. No OpenAPI schema, no request/response examples, and all doc pages render only a 'Connect wallet' stub. The listing is effectively a stub.

Warnings

  • —The specific functionality of /api/v1/cards/39 ('Premium API Access') is completely undocumented — it is unclear what data or service it provides.
  • —All documentation pages (/docs, /pricing, /README, /api) return only a 'Connect wallet' prompt with no substantive content.
  • —No OpenAPI spec, no request schema, and no response examples are available.
  • —Cannot verify what the endpoint actually returns without making a paid request.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 02:51:35Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/HB3JB8
x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart