Kadec0

Kadec0 is an x402-native service at https://api.kadec0.xyz, indexed from the x402 Bazaar (Coinbase's public discovery directory). It charges callers itself in USDC on Base and is paid directly at its own wallet; Monex Protocol passes your request and payment headers through untouched. 12 endpoints listed.

Base

Offers

Offer	Endpoint	Price
V1 Congress Trades US congressional stock trades. Stock transactions disclosed by members of the House and Senate under the STOCK Act — politician, ticker, amount, and date.	`/m/bz-api-kadec0-xyz/v1/congress-trades`	0.05 USDC
V1 Defi Tvl DeFi TVL and protocol data. Total-value-locked for DeFi protocols and chains via DefiLlama — TVL, category, chains, and change.	`/m/bz-api-kadec0-xyz/v1/defi-tvl`	0.02 USDC
V1 Domain Info Domain WHOIS and DNS lookup. Registrar, creation and expiry dates, nameservers, and full DNS records (A, AAAA, MX, NS, TXT, CNAME) for a domain.	`/m/bz-api-kadec0-xyz/v1/domain-info`	0.02 USDC
V1 Fda FDA recalls and adverse events. Drug, device, and food recall and adverse-event records from openFDA with classification, recalling firm, and reason.	`/m/bz-api-kadec0-xyz/v1/fda`	0.02 USDC
V1 Geocode Geocoding and reverse geocoding. Converts an address or place name to latitude/longitude, or coordinates back to an address.	`/m/bz-api-kadec0-xyz/v1/geocode`	0.01 USDC
V1 Github GitHub data. Repository stats, user profiles, and code-search results (stars, forks, language, topics, issues) via the GitHub REST API.	`/m/bz-api-kadec0-xyz/v1/github`	0.02 USDC
V1 Hackernews Hacker News feed. Top, new, and best front-page stories plus full-text story search — titles, scores, comment counts, and author for tech and startup news.	`/m/bz-api-kadec0-xyz/v1/hackernews`	0.01 USDC
V1 Market Sentiment Market fear & greed index. Aggregated investor sentiment from CNN Fear & Greed, the crypto Fear & Greed index, and the VIX volatility gauge.	`/m/bz-api-kadec0-xyz/v1/market-sentiment`	0.05 USDC
V1 Nutrition Food nutrition lookup. Calories, macros, and micronutrients for any food from the USDA FoodData Central database.	`/m/bz-api-kadec0-xyz/v1/nutrition`	0.01 USDC
V1 Papers Academic and scientific paper search API. Search research papers and scholarly literature across arXiv, PubMed, OpenAlex, Crossref, and Semantic Scholar in one call, deduplicated into a ranked result set: title, authors, year, venue, abstract, citation count, DOI, and direct PDF link. Query by keyword or restrict to one source; filter by year range; sort by relevance, recency, or citations. Keyles	`/m/bz-api-kadec0-xyz/v1/papers`	0.02 USDC
V1 Serp Web search results (SERP). Keyless web search returning ranked title, URL, and snippet for a query — with locale/region targeting, freshness filters (past day, week, month, year), pagination, a news mode that adds publish date and source, and selectable backend engine (auto rotation, or pin Brave, Yahoo, or Yandex).	`/m/bz-api-kadec0-xyz/v1/serp`	0.03 USDC
V1 Serp Read Web search plus page reading in one call — answer with sources. Runs a web search, fetches the top results, and returns the ranked list together with each page's content as clean LLM-ready markdown, so an agent gets search results AND the underlying text without a second round of scraping calls. Per-page fetch errors are reported honestly per URL.	`/m/bz-api-kadec0-xyz/v1/serp-read`	0.08 USDC

Machine-readable: openapi.json with x-payment-info offers.

Try it live

Run the full MPP flow from your browser: catch the 402, sign the payment with your wallet, and watch it settle on-chain.

This merchant settles over the mppx rail; pay it from an agent with the snippet below.

Pay with an agent

Any MPP or x402-compatible client works. With mppx, payment is automatic:

import { Mppx, evm } from 'mppx/client'
import { privateKeyToAccount } from 'viem/accounts'

const mppx = Mppx.create({
  methods: [evm({
    account: privateKeyToAccount(process.env.KEY),
    currencies: [evm.assets.base.USDC],
  })],
})

const res = await mppx.fetch('https://api.meshgateway.co/m/bz-api-kadec0-xyz/v1/congress-trades')
// 402 challenge signed and settled automatically; response includes Payment-Receipt

Or inspect the challenge yourself:

curl -i https://api.meshgateway.co/m/bz-api-kadec0-xyz/v1/congress-trades
# HTTP/1.1 402 Payment Required
# WWW-Authenticate: Payment id="…", method="evm", intent="charge", …