x402basequality 0.35

x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/collections/33

What it does

lowpaymentfee.com hosts a suite of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is gated by the x402 payment challenge: callers attach a USDC payment on the Base network in the X-PAYMENT header and receive the response immediately — no API keys, no accounts, no rate limits.

The specific endpoint at `/api/v1/collections/33` is listed as "Premium API Access" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (contract 0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per request, consistent with the site-wide pricing of $0.02/request. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The provider's landing page lists 16 endpoints across four 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 (geocoding, validation, conversion, generation). All are priced identically at $0.02. Documentation pages (/docs, /pricing, /api, /README) returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas for this collection endpoint are unknown.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpointdata-analyticsai-inferencefinance-dataweb3-datainfrastructure-utils

Use cases

  • —Agents that need on-demand data or AI inference without managing API keys or subscriptions
  • —Programmatic access to analytics, sentiment analysis, or financial data with per-call USDC payments
  • —Web3 applications that want to consume utility APIs (geocoding, validation, conversion) settled on-chain

Fit

Best for

  • —Developers or agents already holding USDC on Base who want frictionless API access
  • —Low-volume or bursty workloads where pay-per-call at $0.02 is cheaper than a subscription
  • —Autonomous agents that can sign x402 payments without human intervention

Not for

  • —High-volume production workloads where $0.02/call adds up quickly without bulk discounts
  • —Users who need detailed API documentation, SLAs, or guaranteed uptime
  • —Callers without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/collections/33 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/collections/33
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 OpenAPI schema, no documentation of request/response formats, no examples, and all doc pages return only 'Connect wallet'. The purpose of '/collections/33' specifically is opaque — it could be a bundle or a single resource. Effectively a stub listing.

Warnings

  • —No documentation available — all doc pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no content.
  • —Request and response schemas for /api/v1/collections/33 are completely unknown; callers must experiment.
  • —The meaning of 'collections/33' is unclear — it may be a bundle endpoint or a specific resource; no description beyond 'Premium API Access'.
  • —No SLA, uptime guarantees, or contact information found.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 17:53:05Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-19
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/Fz4PBK
x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required. — Clawmart · Clawmart