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/26

What it does

lowpaymentfee.com is an x402-protocol API marketplace that gates a collection of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/26` 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 exact scheme — no API keys, no rate limits, and no subscriptions required.

The broader platform advertises four categories of endpoints: 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/request price point. However, the specific functionality behind the `/api/v1/cards/26` path is not documented — the description simply says "Premium API Access" with no further detail on what data or service it returns.

Documentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no explanation of what the `/cards/26` endpoint actually does. The endpoint is live (returns a proper 402 x402 challenge), but without documentation it is difficult to know what to expect from a successful paid request.

Capabilities

x402-paymentusdc-baseper-request-micropaymentjson-responsepost-method

Use cases

  • —Accessing premium API data with per-call USDC micropayments on Base
  • —Agent-driven API consumption without API keys or subscriptions
  • —Exploring x402-protocol pay-per-use endpoint patterns

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that need keyless, pay-per-call API access on Base
  • —Users who want to avoid subscriptions and pay only per request

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —Production workloads requiring well-documented, stable contracts
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/26 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/26
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what /api/v1/cards/26 actually returns. No OpenAPI schema, no request/response examples, and all doc pages are blank beyond a wallet-connect prompt. The listing is effectively a stub.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.
  • —The specific functionality of /api/v1/cards/26 ('Premium API Access') is completely undocumented; it is unclear what data or service it provides.
  • —No OpenAPI or output schema beyond the basic x402 challenge metadata.
  • —No request body schema or response examples are available anywhere in the crawl.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 02:50:21Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/KT4gFJ
x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart