x402basequality 0.30

Pay-per-call API platform on Base (USDC) 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/keys/5

What it does

lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/keys/5` 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, accounts, or subscriptions are required; callers simply attach an X-PAYMENT header with a valid payment proof.

The wider 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 listed at the same $0.02/request price point.

However, documentation is extremely sparse. There is no OpenAPI spec, no request/response schema documentation, and the crawled /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no further content. The exact behavior, input parameters, and response format of `/api/v1/keys/5` (or any other endpoint) are not documented in the crawled material. The endpoint is live and returns a valid x402 402 challenge, but what it actually returns after payment is unknown.

Capabilities

x402-paymentusdc-basepay-per-requestpremium-api-accessno-api-key-required

Use cases

  • —Agents needing on-demand API access without managing API keys or subscriptions
  • —Programmatic access to a premium API resource via x402 micropayments
  • —Testing x402 payment flows on Base with low-cost endpoints

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —AI agents that need keyless, pay-per-call API access
  • —Low-volume consumers who want no commitments or rate limits

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone requiring non-crypto payment methods

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/keys/5 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/keys/5
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the purpose of '/api/v1/keys/5' specifically is unclear beyond the label 'Premium API Access'. The /api, /pricing, and /README pages yielded no useful content. This is effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available for any endpoint
  • —The exact functionality and response format of /api/v1/keys/5 is undocumented
  • —All non-root crawled pages (/api, /pricing, /README) returned only 'Connect wallet' with no content
  • —The endpoint name 'Premium API Access' is generic and does not describe what data or service is returned

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 22:21:17Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-21

Agent access

JSONhttps://clawmart.sh/api/listings/uvP26d
Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart