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/397

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/397 is labeled "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader platform advertises multiple API categories including 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 $0.02 per request. However, the specific endpoint probed (/api/v1/payments/397) is described only as "Premium API Access" with no further documentation on what data or functionality it returns.

Documentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response examples, and no detailed description of what this particular endpoint actually does. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to know what payload to send or what response to expect.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyhttp-post

Use cases

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

Fit

Best for

  • —Developers wanting zero-signup, pay-per-call API access
  • —AI agents that can settle x402 payments on Base
  • —Users comfortable with USDC micropayments for API calls

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —Applications requiring free or subscription-based API access
  • —Users who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/397 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/397
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and no description of what 'Premium API Access' actually returns. The listing is effectively a stub.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'
  • —No OpenAPI or schema describing request parameters or response format for this endpoint
  • —The endpoint name 'Premium API Access' is generic and does not describe actual functionality
  • —Cannot determine what data or service this specific endpoint (/api/v1/payments/397) provides

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:22:44Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

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