x402basequality 0.30

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/344

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/344 is labeled "Premium API Access" and accepts POST requests, charging up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments 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 $0.02 per request. However, the specific functionality behind the /api/v1/payments/344 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" scheme with a 300-second timeout. Documentation pages (/docs, /pricing, /api, /README) all returned only a "Connect wallet" prompt with no substantive content, so detailed request/response schemas are unavailable.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keypost-endpointjson-response

Use cases

  • —Programmatic access to a pay-per-call API without needing API keys or subscriptions
  • —Agent-driven workflows that need to pay for API calls on-chain via x402
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —AI agents that can autonomously pay for API calls with USDC on Base
  • —Users who want no-commitment, no-signup API access

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-volume use cases where per-request pricing at $0.02 adds up significantly
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/344 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/344
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the actual functionality behind 'Premium API Access' is undefined. All doc pages returned only 'Connect wallet' with no content.

Warnings

  • —The specific functionality of /api/v1/payments/344 ('Premium API Access') is not documented — it is unclear what data or service it returns.
  • —All documentation pages (/docs, /pricing, /api, /README) returned no substantive content, only a 'Connect wallet' prompt.
  • —No OpenAPI spec, request schema, or response schema is available.
  • —The platform lists many API categories (AI, finance, analytics, etc.) but none are documented with input/output details.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:05:04Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/ar2J8H
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart