Discover / api.vextorium.com

Historical ECB rates | Vextorium

■ Challenge detected

Historical ECB euro reference exchange rate for any date since 1999 and conversion between any two published currencies.

x402
Base
EVM chain 5042
Optimism
Polygon
Solana
Xrpl
USDC
XRP
Blockchain

Listed price: $0.003
Challenge detected: 4 of the last 10 checks
Median response: 388 ms
Last checked: 18 Oct, 09:23 UTC
In our index since: 27 Sept 2026

Endpoint

curl -i https://api.vextorium.com/v1/ecb-rates-history
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

1,069 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

Base URLhttps://api.vextorium.com

POST/v1/hyperliquid-orderbookNo price listedOrder book of a Hyperliquid perpetual: best bid/ask, spread in basis points, mid price, top levels and USD liquidity within ±0.5%, ±1% and ±2% of mid. Use it to estimate slippage before trading.
POST/evm-red-info-pagoNo price listedNetwork status: chainId, block height and age, gas price, base fee, suggested priority fee, node client version and sync status. Works on Base, Ethereum, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Gnosis, Linea, Scroll, Sonic and Unichain.
POST/sitemap-urls-pagoNo price listedList the URLs of a site's XML sitemap (found via robots.txt if needed, following sitemap indexes and .gz files) with last-modified dates, optionally filtered by text. Discover a site's pages for crawling or monitoring.
POST/v1/mastodon-hashtagNo price listedLatest public Mastodon (fediverse) posts with a hashtag on any instance, with author, text, favourites, boosts and replies.
POST/leer-contrato-pagoNo price listedCall any read-only (view) function of an EVM contract from its signature, e.g. balanceOf(address)(uint256), with arguments, and get the decoded result. Supports address, bool, intN/uintN, bytesN, string, bytes and arrays. Read-only: nothing is signed or sent.
POST/tipos-medios-deuda-eeuu-pagoNo price listedAverage interest rate the US Treasury pays on its debt by instrument (bills, notes, bonds, TIPS, FRNs...) and total, with the rate one year earlier. US Treasury, public domain.
POST/contrato-verificado-pagoNo price listedChecks whether a smart contract's source code is verified and public on Sourcify, on any EVM chain: match type, contract name, compiler, number of functions and a sample. Verified code = transparent and auditable (not a safety guarantee). Live from Sourcify.
POST/vulnerabilidades-paquete-pagoNo price listedKnown vulnerabilities of a software package (npm, PyPI, Go, Maven, crates.io, NuGet, RubyGems, Packagist...) at a given version or overall: CVE/GHSA ids, summary, severity, publication date and fixed versions. Google's OSV.dev database.
POST/siwe-verificar-pagoNo price listedVerify a Sign-In with Ethereum (EIP-4361) login: parses domain, address, chain, nonce and dates, checks the signature and expiry, and optionally the expected domain and nonce. Authenticate users or agents by wallet.
POST/contrato-info-pagoNo price listedAddress inspector for EVM chains: wallet (EOA), EIP-7702 delegated wallet or contract; bytecode size, ERC-20/721/1155 support, proxy implementation and beacon, nonce and native balance.
POST/v1/spain-company-registryNo price listedCompany acts registered in Spain's Commercial Registry (BORME section A) for a province and day: new companies with business purpose, address and share capital, dissolutions, insolvencies, capital increases, moves... Filter by act type or name. Company data only. Official BOE open data.
POST/gas-comparar-pagoNo price listedGas price right now on Base, Ethereum, Arbitrum, Optimism and Polygon, with the estimated USD cost of a native transfer, an ERC-20 transfer and a swap on each, and the cheapest chain.
POST/v1/safe-multisigNo price listedInspect a Safe (Gnosis Safe) multisig on Base, Ethereum, Arbitrum, Optimism or Polygon: owners, signature threshold (M of N), nonce, version and enabled modules, with warnings (single-signer, modules that bypass owners).
POST/proxy-detectar-pagoNo price listedDetect whether a contract is an upgradeable proxy (EIP-1967 transparent/UUPS, beacon, ZeppelinOS, EIP-1167 minimal) and return implementation, admin and beacon. Works on Base, Ethereum, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Gnosis, Linea, Scroll, Sonic and Unichain.
POST/comprobar-enlaces-pagoNo price listedCheck whether a list of URLs, or every link on a page, works: HTTP status, final URL after redirects and broken links first. Up to 50 URLs per call, checked in parallel.
POST/robots-txt-pagoNo price listedParse a site's robots.txt: whether a user-agent may crawl a path, which AI crawlers (GPTBot, ClaudeBot, Google-Extended, PerplexityBot, CCBot...) are blocked, and declared sitemaps. Check before your agent scrapes.
POST/sentimiento-pagoNo price listedMarket sentiment of any text (news, posts, tweets; any language) via local AI (Qwen3-4B): bullish / bearish / neutral, score -1 to 1, confidence, mentioned assets and a short reason.
POST/v1/evm-token-supplyNo price listedtotalSupply of an ERC-20 token or ERC-721 collection with name, symbol and decimals. Works on Base, Ethereum, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Gnosis, Linea, Scroll, Sonic and Unichain.
POST/v1/x402-searchNo price listedSearch x402 paid services in the Bazaar by keyword (e.g. weather, solana, search) ranked by real usage, with price, networks and ready-to-pay URL. Lets an agent find the service it needs.
POST/evm-saldos-vivos-pagoNo price listedLive balance of a wallet: native coin plus up to 20 ERC-20 tokens you choose (USDC/USDT by default) in one call. Works on Base, Ethereum, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Gnosis, Linea, Scroll, Sonic and Unichain.
POST/redirecciones-url-pagoNo price listedFollow the redirect chain of a URL (up to 10 hops): status code and time of each hop, final URL, domain changes and HTTPS-to-HTTP downgrades. Unmask short and affiliate links before visiting them.
POST/electricidad-precios-ue-pagoNo price listedAverage household electricity price (2,500-5,000 kWh/year band) in EUR/kWh by European country, with or without taxes: ranking or half-yearly evolution of one country. Official Eurostat data.
POST/v1/revoke-approvalNo price listedBuild the transaction that revokes a contract's permission over an ERC-20 token (approve(spender, 0)): target and calldata ready to sign in your wallet. Nothing is sent.
POST/v1/contract-address-predictNo price listedCompute a contract address in advance: CREATE (deployer + nonce) or CREATE2 (deployer + salt + init code hash). For deterministic deployments and verifying announced addresses.
POST/v1/hackernews-userNo price listedHacker News user profile: karma, account age, bio and latest submissions (stories and comments).

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 25 of 1,069 listed endpoints. Next endpoints First endpoints

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/api.vextorium.com

Recent checks

4 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.18 Oct 2026

All 10 checks

When (UTC)	Result	HTTP	Response
18 Oct, 09:23 UTC	Challenge detected	402	380ms
17 Oct, 07:50 UTC	Challenge detected	402	372ms
15 Oct, 23:42 UTC	Challenge detected	402	395ms
14 Oct, 19:26 UTC	Challenge detected	402	417ms
12 Oct, 22:31 UTC	No challenge detected	200	423ms
11 Oct, 00:15 UTC	No challenge detected	200	394ms
9 Oct, 15:32 UTC	No challenge detected	200	382ms
8 Oct, 09:33 UTC	No challenge detected	200	429ms
7 Oct, 03:32 UTC	No challenge detected	200	376ms
4 Oct, 17:05 UTC	No challenge detected	200	394ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 18 Oct, 09:23 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for Historical ECB rates | Vextorium?

Its listed price is $0.003.

What payment terms does Historical ECB rates | Vextorium advertise?

The listing advertises x402, Base, EVM chain 5042, Optimism, Polygon, Solana, Xrpl, USDC and XRP. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is Historical ECB rates | Vextorium listed?

In x402 Bazaar and x402-list.com. Superstables first indexed it on 27 Sept 2026.

Payment

Protocol: x402 · exact
Chains: Base, EVM chain 5042, Optimism, Polygon, Solana, Xrpl
Asset: USDC, XRP
Amount: 3000 atomic USDC
Paid to: HcjfmZ…3pz2
Facilitator: cdp

From its payment challenge on 18 Oct 2026.

Check the seller's current payment challenge and authentication requirements before paying. A listing doesn't mean a service works with Superstables. To try a budget or a single purchase, see the services you can try on testnet.

Listed in

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