x402basequality 0.35

Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/180

What it does

lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/180` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers pay per request via the x402 protocol's X-PAYMENT header.

The wider platform advertises four endpoint 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 utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, the specific `/api/v1/inbox/180` path does not clearly map to any of these named endpoints, so its exact functionality is unknown.

The endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme "exact", accepting POST requests. Payment is directed to wallet `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maximum timeout is 300 seconds. No OpenAPI schema, detailed documentation, or example request/response bodies were found in the crawl.

Capabilities

x402-paymentusdc-basepay-per-requestpost-endpointno-api-keyno-rate-limit

Use cases

  • —Accessing data analytics or reports on a per-request basis without subscription
  • —Running AI inference (sentiment, summarization, classification, embeddings) with per-call payment
  • —Fetching real-time financial data such as token quotes, exchange rates, or gas estimates
  • —Using utility services like geocoding, validation, or data conversion

Fit

Best for

  • —Agents or developers who want API access without managing API keys or subscriptions
  • —Low-volume or sporadic API consumers who prefer pay-per-use pricing
  • —Crypto-native applications that can settle payments in USDC on Base

Not for

  • —High-volume production workloads where $0.02/request adds up significantly
  • —Users who need detailed API documentation, schemas, or SLAs before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/180 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/180
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, but the specific path /api/v1/inbox/180 has no documentation explaining what it does. No OpenAPI schema, no request/response examples, and the crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The endpoint's purpose is essentially unknown.

Warnings

  • —The path /api/v1/inbox/180 does not correspond to any of the named endpoints listed on the homepage; its actual functionality is unclear.
  • —No API documentation, OpenAPI schema, or example request/response bodies are available.
  • —The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet').
  • —Without knowing what this endpoint returns, callers cannot verify it provides useful data.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:40:03Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/mpqzBc
Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart