x402basequality 0.35

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/charges/55

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/charges/55` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — each request is paid individually via an X-PAYMENT header containing a signed payment.

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 being listed here (`/api/v1/charges/55`) is labeled generically as "Premium API Access" and does not appear in the site's public API catalog, so its exact functionality is unclear.

Payments settle on the Base L2 network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge uses the "exact" payment scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.

Capabilities

x402-paymentusdc-basepay-per-requestjson-responseno-api-keypost-method

Use cases

  • —Programmatic access to premium API functionality with per-call USDC payments
  • —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers or agents wanting zero-signup, pay-per-use API access
  • —x402-compatible wallets and agent frameworks on Base
  • —Low-cost experimentation with crypto-settled API calls

Not for

  • —Users who need detailed documentation or OpenAPI schemas before integrating
  • —High-volume use cases where per-call crypto settlement overhead matters
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/55 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <signed-x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/55
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/charges/55 is not described anywhere on the site. The docs, pricing, and API pages all render only a 'Connect wallet' prompt with no useful content.

Warnings

  • —The endpoint /api/v1/charges/55 does not appear in the site's public API catalog — its actual functionality is unknown.
  • —No documentation, OpenAPI spec, or request/response examples are available.
  • —All crawled subpages (docs, api, pricing, README) returned only 'Connect wallet' with no substantive content.
  • —The exact behavior behind 'Premium API Access' is unspecified — callers cannot know what data or service they are paying for.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 04:04:31Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/Xv6qJP
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart