x402basequality 0.30

Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/226

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 at /api/v1/payments/226 is labeled "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform lists endpoints across four 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 thin. The /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no actual technical documentation, request/response schemas, or usage examples. It is unclear what this specific endpoint (/api/v1/payments/226) actually returns or what input it expects beyond a POST request. The endpoint is live and returns a valid x402 402 challenge, but without documentation it is difficult to assess the quality or utility of the data returned.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keypost-endpoint

Use cases

  • —Accessing premium API data with per-request USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints

Fit

Best for

  • —Developers wanting zero-signup, pay-per-call API access
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users who need detailed API documentation or response schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Developers who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/226 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/226
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no request/response schema, no examples, and the actual functionality of this specific endpoint is unknown. The docs pages are all empty 'Connect wallet' stubs.

Warnings

  • —No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.
  • —The specific functionality of /api/v1/payments/226 ('Premium API Access') is undocumented; it is unclear what data or service it provides.
  • —No request body schema or response schema is available; integration requires trial-and-error.
  • —The platform lists many endpoint categories (AI, analytics, finance, infrastructure) but none have documented schemas or examples.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 06:52:43Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/9LYNuN
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart