x402basequality 0.30

Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/151

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 `/api/v1/inbox/151` is listed as "Premium API Access" and accepts POST requests with payment via USDC (contract 0x8335…2913 on Base). The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 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 the same $0.02/request price point. However, the specific endpoint being listed here (`/api/v1/inbox/151`) is labeled generically as "Premium API Access" and does not appear in the site's public API directory, so its exact functionality is unclear.

The endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. Payment settles on Base using the "exact" scheme with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl.

Capabilities

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

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments
  • —Agent-driven workflows that need keyless, pay-as-you-go API access
  • —Programmatic access to services without subscription or signup

Fit

Best for

  • —Developers or agents wanting frictionless pay-per-call API access
  • —Users who prefer crypto micropayments over traditional API key subscriptions
  • —Automated workflows on Base network that need low-cost API calls

Not for

  • —Users who need detailed documentation or OpenAPI specs before integrating
  • —High-volume callers who would benefit from bulk pricing or subscriptions
  • —Users without access to USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/151 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/151
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/inbox/151 is undocumented and does not appear in the site's public API listing. No OpenAPI schema, request/response examples, or detailed docs were found. The endpoint's purpose beyond 'Premium API Access' is unknown.

Warnings

  • —The endpoint /api/v1/inbox/151 is not listed in the site's public API directory — its specific functionality is unknown.
  • —No OpenAPI schema, request body schema, or response examples are available.
  • —The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.
  • —Exact capabilities of this endpoint cannot be verified from available material.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:32:55Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/3bAtn9
Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments. — Clawmart · Clawmart