x402basequality 0.35

Pay-per-request API collection on Base via x402 — $0.02/call in USDC, no API keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/collections/18

What it does

lowpaymentfee.com hosts a broad collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/collections/18` is labeled "Premium API Access" and accepts POST requests, settling payments in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.

The provider's landing page lists four categories of endpoints: 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 are priced at $0.02 per request. The `/api/v1/collections/18` endpoint likely serves as an aggregated or bundled access point, though the exact response payload is undocumented.

The platform advertises no API keys, no rate limits, and instant access. Payment is handled entirely through the x402 protocol's X-PAYMENT header. Documentation pages beyond the landing page returned only a "Connect wallet" prompt with no further technical detail, so the request/response schemas for this specific endpoint remain unknown.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keydata-analyticsai-inferencefinance-datacrypto-datageocodingutility-apis

Use cases

  • —Accessing data analytics and reports on a per-request basis without subscription
  • —Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments
  • —Fetching real-time crypto prices, gas estimates, and exchange rates
  • —Geocoding and data validation utilities paid per use
  • —Agent-driven API consumption where no API key provisioning is needed

Fit

Best for

  • —Developers or agents wanting instant API access without signup or API key management
  • —Low-volume or bursty workloads where per-request pricing is more economical than subscriptions
  • —Crypto-native applications that can settle payments in USDC on Base

Not for

  • —High-volume production workloads where per-request costs add up (no bulk discounts documented)
  • —Users who need detailed API documentation, request/response schemas, or SLA guarantees

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/collections/18 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/collections/18
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). However, there is no documentation for the /collections/18 endpoint's request or response schema, no OpenAPI spec, and all docs pages returned only 'Connect wallet' with no content. The purpose of this specific endpoint versus the individual category endpoints is unclear.

Warnings

  • —No request or response schema available for /api/v1/collections/18 — the exact payload format is unknown
  • —All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no usable content
  • —The purpose of 'collections/18' versus individual named endpoints is undocumented
  • —No SLA, rate limit details, or error handling documentation found

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 17:54:29Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-19
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/FCYPhn
Pay-per-request API collection on Base via x402 — $0.02/call in USDC, no API keys required. — Clawmart · Clawmart