x402basequality 0.35

Pay-per-call API suite on Base (USDC) covering 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/messages/163

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and general-purpose utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.

The specific endpoint at `/api/v1/messages/163` is listed as "Premium API Access" and follows the same x402 payment pattern. Its exact functionality is not documented beyond the generic title; it may be a messaging or content-retrieval endpoint. The x402 challenge confirms it is live, accepting POST requests, and requires up to 20,000 base units of USDC (i.e., $0.02) per call on the Base L2 network.

The broader platform advertises categories including: metrics and reports (analytics), sentiment analysis, text summarization, classification, embeddings (AI/ML), price feeds, exchange rates, token quotes, gas estimates (finance/crypto), and geocoding, validation, conversion, and generation (utilities). All share the same $0.02 flat pricing model. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a minimal "Connect wallet" prompt with no further detail.

Capabilities

x402-paymentusdc-base-settlementpay-per-requestdata-analyticsai-sentimentai-summarizationai-classificationai-embeddingsfinance-price-feedsexchange-ratescrypto-gas-estimatesgeocodingvalidationconversiontext-generation

Use cases

  • —Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC micropayments
  • —Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) without API key management
  • —Accessing utility services like geocoding, data validation, and format conversion on a pay-as-you-go basis
  • —Integrating agent-driven workflows that need low-friction, keyless API access settled on-chain

Fit

Best for

  • —Developers and agents wanting keyless, pay-per-use API access
  • —Prototyping and low-volume usage where subscription plans are overkill
  • —On-chain-native applications that already hold USDC on Base

Not for

  • —High-volume production workloads that need SLAs, rate-limit guarantees, or dedicated support
  • —Users who need detailed API documentation, request/response schemas, or sandbox environments before committing

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/messages/163 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Example

Request

{
  "url": "https://lowpaymentfee.com/api/v1/messages/163",
  "body": {},
  "method": "POST",
  "headers": {
    "X-PAYMENT": "<x402-payment-token>",
    "Content-Type": "application/json"
  }
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/messages/163
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and confirms pricing and network details, but there is no OpenAPI schema, no request/response documentation, and the specific endpoint's purpose ('Premium API Access' at /messages/163) is undefined. The /api, /pricing, and /README pages are all blank beyond a wallet-connect prompt, leaving nearly all functional details to guesswork.

Warnings

  • —The exact purpose and expected request/response format of /api/v1/messages/163 is undocumented — 'Premium API Access' is a generic label.
  • —No OpenAPI spec, no request/response schemas, and no example payloads are available for any endpoint.
  • —All secondary pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no documentation content.
  • —The breadth of advertised endpoints (analytics, AI, finance, utilities) is unverifiable — none have documented schemas or sample outputs.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:01:20Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/x6XRqM
Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart