x402basequality 0.35

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/payments/349

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/349` is listed as "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys, rate limits, or upfront commitments are required — each request is paid for individually via the x402 payment header.

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/349` endpoint is not documented beyond its "Premium API Access" label.

Payments settle on the Base L2 network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge specifies a 300-second payment timeout and uses the "exact" payment scheme. The endpoint accepts POST requests and returns `application/json` responses.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyjson-responsepost-method

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments on Base
  • —Integrating pay-as-you-go API calls into agent workflows without managing API keys
  • —Testing x402 protocol-based payment flows for API monetization

Fit

Best for

  • —Developers wanting zero-commitment, pay-per-use API access
  • —AI agents that can settle x402 payments autonomously
  • —Projects already operating on the Base L2 network with USDC

Not for

  • —Users who need detailed API documentation or schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/payments/349 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/payments/349
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no documentation of what the endpoint actually does beyond the generic label "Premium API Access," no request/response schema, no examples, and the docs/pricing/API pages all render only a wallet-connect prompt with no useful content.

Warnings

  • —The specific functionality of /api/v1/payments/349 is undocumented — 'Premium API Access' is the only description available.
  • —Documentation pages (/docs, /api, /pricing, /README) all render only a 'Connect wallet' prompt with no actual content.
  • —No OpenAPI spec, request schema, or response schema is available for this endpoint.
  • —The platform lists many API categories (AI, finance, analytics, etc.) but it is unclear which, if any, are fully implemented behind this endpoint.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 07:03:50Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/Cg5UHE
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required. — Clawmart · Clawmart