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/214

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/charges/214` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show "Connect wallet"), so the actual request/response schemas for individual endpoints are unknown.

Capabilities

x402-paymentpay-per-requestusdc-settlementbase-networkdata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datageocodingutility-services

Use cases

  • —Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management
  • —Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis
  • —Geocoding and data validation utilities paid per request via USDC on Base

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —Agent workflows that can attach x402 payment headers automatically
  • —Projects already operating on the Base L2 network with USDC

Not for

  • —High-volume use cases where per-request pricing at $0.02 adds up quickly
  • —Users who need detailed API documentation and request/response schemas before integrating
  • —Teams without Base network USDC or x402-compatible tooling

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/214 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/214
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc pages render only "Connect wallet" with no schema, parameter, or response information. The specific purpose of /api/v1/charges/214 ("Premium API Access") is unclear and undifferentiated from the other endpoints. No request or response schemas are available.

Warnings

  • —Documentation pages (/docs, /api, /pricing, /README) are all empty beyond a 'Connect wallet' prompt — no usable API docs exist.
  • —The specific function of /api/v1/charges/214 ('Premium API Access') is not documented; it is unclear what data or service it provides.
  • —No OpenAPI spec, request schemas, or response examples are available for any endpoint.
  • —The breadth of advertised capabilities (AI, finance, geocoding, etc.) cannot be verified from available materials.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:33:31Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/5ZZufH
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart