x402basequality 0.25

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/inbox/135

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 at `/api/v1/inbox/135` 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 per request price point.

Important caveat: the specific endpoint being listed here (`/api/v1/inbox/135`) does not clearly map to any of the named API categories on the landing page. Its description is simply "Premium API Access" with no further documentation on what it accepts or returns. There is no OpenAPI spec, no request/response examples, and the pricing, README, and API doc pages all resolve to a minimal "Connect wallet" prompt with no additional content. Prospective callers should treat this as a minimally documented endpoint until more information is available.

Capabilities

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

Use cases

  • —Programmatic access to paid API endpoints without account registration
  • —Agent-driven workflows that need instant, keyless API access settled in USDC
  • —Testing x402 payment flows against a live endpoint on Base

Fit

Best for

  • —Developers or agents wanting zero-signup, pay-per-use API access
  • —x402 protocol integrators looking for a live test surface
  • —Users who prefer crypto micropayments over traditional API billing

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —Anyone without USDC on the Base network
  • —Production workloads requiring well-documented request/response schemas

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/135 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/135
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a generic label, and the /api, /pricing, and /README pages are empty. The specific inbox/135 path doesn't correspond to any documented API on the landing page. Effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —The path /api/v1/inbox/135 does not match any of the documented API routes on the landing page
  • —All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content
  • —Purpose and expected input/output of this specific endpoint are unknown

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:33:27Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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