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/payments/363

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/363` is labeled "Premium API Access" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are required — 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 the same $0.02/request price point. However, the specific functionality behind the `/api/v1/payments/363` endpoint is not documented beyond its "Premium API Access" label, so its exact behavior 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-requestno-api-keyjson-responsepost-method

Use cases

  • —Programmatic access to premium API services without account registration
  • —Agent-driven API consumption with per-call USDC micropayments on Base
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers wanting zero-signup API access via crypto micropayments
  • —AI agents that need to autonomously purchase API calls
  • —Users already holding USDC on the Base network

Not for

  • —Users who need detailed documentation on what the endpoint actually returns
  • —Anyone requiring fiat payment rails or non-crypto billing
  • —High-volume consumers who prefer subscription-based pricing

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/363 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/363
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 on what the endpoint actually does or returns. No OpenAPI schema, no example requests/responses, and the crawled docs/pricing/API pages are all blank beyond a wallet-connect prompt. The "Premium API Access" label is generic and uninformative.

Warnings

  • —The exact functionality of /api/v1/payments/363 is undocumented — 'Premium API Access' is the only description available.
  • —All documentation, pricing, and API pages beyond the landing page render only a 'Connect wallet' prompt with no useful content.
  • —No OpenAPI spec, request schema, or response schema is available for this endpoint.
  • —The platform lists many API categories (AI, finance, data, etc.) but it is unclear which, if any, are fully functional.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:05:32Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

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