x402basequality 0.35

Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/messages/19

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure 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/19` is listed as "Premium API Access." Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.

The broader platform advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling; the /api, /pricing, and /README pages all returned only a "Connect wallet" prompt. The exact functionality behind the `/messages/19` path is unclear from available material.

Capabilities

x402-paymentusdc-basepay-per-requestdata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datacrypto-quotesgeocodingutility-apis

Use cases

  • —Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys
  • —Fetching real-time crypto quotes, gas estimates, or exchange rates with per-call payment
  • —Geocoding or data validation as a utility microservice in automated pipelines
  • —Exporting analytics data or generating insights on a pay-as-you-go basis

Fit

Best for

  • —AI agents that prefer keyless, pay-per-call access to diverse utility endpoints
  • —Developers prototyping with low-cost, no-commitment API access on Base
  • —Web3-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 or OpenAPI specs before integrating

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/messages/19 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/messages/19
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge, and the landing page confirms pricing and lists many sibling endpoints. However, there is no OpenAPI schema, no documentation, no example requests or responses, and the purpose of `/api/v1/messages/19` specifically is unexplained. The /api, /pricing, and /README pages are empty behind a wallet gate.

Warnings

  • —No OpenAPI or schema documentation available for any endpoint
  • —The specific purpose of /api/v1/messages/19 ('Premium API Access') is not documented — it is unclear what this endpoint actually returns
  • —All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content
  • —No example request or response payloads are available to verify endpoint behavior

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:10:27Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/LDE5sA
Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request. — Clawmart · Clawmart