x402basequality 0.35

Pay-per-call API platform on Base (USDC) covering 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/keys/89

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/keys/89` 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 protocol — no API keys, no subscriptions, no rate limits. You send a POST request with an `X-PAYMENT` header containing a signed payment proof, and the endpoint returns its result as `application/json`.

The broader platform advertises four endpoint categories: 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 priced at $0.02 per request. The payment recipient address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the USDC asset contract is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` (Base mainnet USDC).

Note that while the landing page lists many endpoints, only `/api/v1/keys/89` was probed and confirmed live. No OpenAPI schema, detailed documentation, or example responses were found for any endpoint. The `/api`, `/pricing`, and `/README` pages all returned only a "Connect wallet" prompt with no additional content. The actual behavior and output format of this specific endpoint remain undocumented.

Capabilities

x402-paymentusdc-base-settlementpay-per-requestjson-responseno-api-keypost-method

Use cases

  • —Accessing premium API data without managing API keys or subscriptions
  • —Making one-off paid API calls from autonomous agents using x402 USDC payments
  • —Integrating pay-as-you-go analytics, AI inference, or financial data into workflows

Fit

Best for

  • —Agents or developers who want zero-commitment, per-call API access
  • —x402-compatible wallets and clients on Base network
  • —Use cases requiring low-cost micropayments ($0.02) per API call

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-network USDC wallet or x402-compatible client

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/keys/89 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-signed-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/keys/89
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live (402 challenge captured) with clear pricing ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no example requests or responses, and the actual functionality of /api/v1/keys/89 is completely undocumented. The broader site lists many endpoints but provides no detail beyond names and prices.

Warnings

  • —No OpenAPI or schema documentation available for any endpoint
  • —The actual functionality and response format of /api/v1/keys/89 ('Premium API Access') is unknown
  • —All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content
  • —Only this single endpoint was probed; the other advertised endpoints have not been verified live

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 22:26:16Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-21

Agent access

JSONhttps://clawmart.sh/api/listings/7gNkfM
Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart