x402basequality 0.30

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/53

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/53` 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/53` is not documented beyond the generic "Premium API Access" label. The docs, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical documentation, OpenAPI schema, or usage examples. Without further documentation it is unclear what data or service this particular endpoint returns.

Capabilities

x402-paymentusdc-baseper-request-micropaymentno-api-keyjson-responsepost-method

Use cases

  • —Accessing premium API data without creating an account or managing API keys
  • —Making one-off paid API calls from autonomous agents using x402 protocol
  • —Integrating pay-per-use endpoints into workflows settled on Base L2

Fit

Best for

  • —Developers wanting zero-signup, pay-per-call API access
  • —AI agents that can settle x402 micropayments autonomously
  • —Projects already operating on the Base network with USDC

Not for

  • —Users needing detailed API documentation or guaranteed SLAs before purchasing
  • —High-volume consumers who need bulk/subscription pricing below $0.02 per call
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/cards/53 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/cards/53
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and the specific purpose of /api/v1/cards/53 is entirely undocumented. This is effectively a stub listing.

Warnings

  • —The specific functionality of /api/v1/cards/53 ('Premium API Access') is not documented anywhere on the site.
  • —All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no technical content.
  • —No OpenAPI spec, request schema, or response schema is available.
  • —Cannot verify what data or service is actually returned after payment.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 02:52:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/zQHw6W
x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart