x402basequality 0.30

Pay-per-call API platform on Base with $0.02 USDC requests via x402 — no keys, no rate limits.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/keys/6

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/keys/6` is listed as "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). Payment is settled on-chain to a specified wallet address, with no API keys or rate limits required.

The broader platform advertises multiple API 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, the specific endpoint being listed here (`/api/v1/keys/6`) is labeled generically as "Premium API Access" and does not appear in the site's public API directory, so its exact functionality is unclear.

The endpoint is live and returns a valid x402 402 challenge. No OpenAPI schema, detailed documentation, or example responses were found in the crawl. The `/api`, `/pricing`, and `/README` pages all returned only a "Connect wallet" prompt with no additional content. Without documentation or an output schema describing what this endpoint actually returns, agents should treat this as a minimally documented endpoint with uncertain functionality.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keyon-chain-settlement

Use cases

  • —Programmatic access to a pay-per-call API without needing API key registration
  • —Agent-driven workflows that settle per-request payments in USDC on Base
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers exploring x402 payment protocol integrations
  • —Agents that need keyless, on-demand API access settled in USDC
  • —Low-cost per-request API consumption without subscriptions

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-throughput use cases where $0.02/request adds up significantly
  • —Anyone needing clarity on what data this specific endpoint returns

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/keys/6 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/keys/6
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/keys/6 is undocumented. No OpenAPI spec, no example requests/responses, and the crawled pages beyond the homepage were empty. The endpoint name 'Premium API Access' is generic and doesn't appear in the site's listed API catalog, making its purpose unclear.

Warnings

  • —The exact functionality of /api/v1/keys/6 is unknown — it does not appear in the site's public API directory
  • —No OpenAPI schema, documentation, or example responses are available
  • —The /api, /pricing, and /README pages returned no useful content beyond 'Connect wallet'
  • —The endpoint name 'Premium API Access' is generic and could mean anything

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 22:16:43Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-21

Agent access

JSONhttps://clawmart.sh/api/listings/LmRBPG
Pay-per-call API platform on Base with $0.02 USDC requests via x402 — no keys, no rate limits. — Clawmart · Clawmart