X402 Tools MCP Server

by workers-kikoribera03-flat-rate-llm Your server? Claim it

answering

X402 Tools is answering right now. Last checked 2 min ago. It exposes 66 tools.

61 x402 pay-per-call tools that chain: each answer names the next call. No API key, no account.

Uptime history 10 days of history

10 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

240 ms

Response time

average over 24h

open, no key

Access

streamable-http

What changed 135

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 9 September 2026. No other catalogue keeps this.

13 Sep 4 tool descriptions were rewritten ai_image, ai_transcribe, catalog and 1 more

13 Sep 3 tools appeared ai_image, ai_speech, ai_transcribe

12 Sep a tool appeared evm_token_price

12 Sep a tool description was rewritten catalog

11 Sep 60 tool descriptions were rewritten64 times that day catalog, content_advice, content_fact and 57 more

11 Sep 9 tools appeared crypto_sanctions, fx_convert, red_asn and 6 more

10 Sep 24 tools appeared content_advice, content_fact, content_horror_story and 21 more

10 Sep a tool description was rewritten9 times that day catalog

10 Sep 2 tools changed the parameters they ask for random_pick, random_shuffle

9 Sep 17 tool descriptions were rewritten evm_balance, evm_block, evm_chains and 14 more

and 13 more, back to 9 September 2026

Nothing serious here today

Today is the operative word: we check X402 Tools every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 2 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add x402-tools --transport http https://flat-rate-llm.kikoribera03.workers.dev/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "x402-tools": {
      "url": "https://flat-rate-llm.kikoribera03.workers.dev/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.x402-tools]
url = "https://flat-rate-llm.kikoribera03.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "x402-tools": {
      "url": "https://flat-rate-llm.kikoribera03.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "x402-tools": {
      "url": "https://flat-rate-llm.kikoribera03.workers.dev/mcp"
    }
  }
}

Available tools 66

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

evm

evm_balance

Native coin balance (ETH, MATIC...) for any address, on Base, Ethereum, Polygon, Arbitrum or Optimism. Flat price, no rate limits, no API key. Via eth_getBalance. $0.005 per call, paid over x402 (USDC).

evm_block

Latest block height and timestamp of any supported chain, plus how old the chain head is in seconds. Tells an agent whether a node is in sync. Via eth_getBlockByNumber. $0.005 per call, paid over x402 (USDC).

evm_call

Runs any read-only contract call (eth_call) with your own calldata and returns the raw result, on five chains, with no API key and no rate limit. The escape hatch for anything the typed endpoints do not cover. $0.005 per call, paid over x402 (USDC).

evm_chains

Live health of every supported chain in one call: chain id, block height and how stale the head is. Use it to pick a chain that is actually responding. Via eth_getBlockByNumber. $0.005 per call, paid over x402 (USDC).

evm_ens

Resolves an ENS name to its address, or an address back to its primary ENS name, reading Ethereum mainnet directly. Names are what humans paste and addresses are what chains need. $0.005 per call, paid over x402 (USDC).

evm_erc20_allowance

How much of a token a spender is still allowed to move on an owner's behalf, and whether that approval is unlimited. The check to run before an approve, and the one that finds forgotten infinite approvals. Via eth_call (allowance). $0.005 per call, paid over x402 (USDC).

evm_erc20_balance

ERC20 token balance for any wallet - USDC, USDT, DAI or any token - via balanceOf. Returns the raw amount and the decimals so you can format it. Via eth_call (balanceOf). $0.005 per call, paid over x402 (USDC).

evm_estimate_gas

Estimates the gas a transaction would need and prices it at the current gas price, before you sign anything. Also the cheapest way to find out that a call would revert. Via eth_estimateGas. $0.005 per call, paid over x402 (USDC).

evm_fees

Suggested maxFeePerGas and maxPriorityFeePerGas from the last 20 blocks of real fee history, at slow, normal and fast percentiles. Beats guessing a gas price and getting stuck in the mempool. Via eth_feeHistory. $0.005 per call, paid over x402 (USDC).

evm_gas

Current gas price and base fee for any supported chain, in wei and gwei, plus the cost estimate of a plain transfer. For agents planning a transaction. Via eth_gasPrice. $0.005 per call, paid over x402 (USDC).

evm_is_contract

Tells whether an address is a smart contract or a plain wallet, and how big its bytecode is. A cheap safety check before sending funds. Via eth_getCode. $0.005 per call, paid over x402 (USDC).

evm_nft_owner

Who owns a given ERC721 token id, plus its tokenURI and collection name in the same call. Answers is this NFT still theirs without an indexer or an API key. Via eth_call (ownerOf). $0.005 per call, paid over x402 (USDC).

evm_nonce

Next transaction nonce for any address, and whether the address is a contract. What an agent needs before signing a transaction. Via eth_getTransactionCount. $0.005 per call, paid over x402 (USDC).

evm_portfolio

Native balance plus the balance of every token you list, on one chain, in a single paid call - each with symbol and decimals already applied. One request instead of one per token. Via eth_getBalance + eth_call. $0.005 per call, paid over x402 (USDC).

evm_receipt

Receipt of a transaction: whether it succeeded or reverted, gas used, fee actually paid, and how many logs it emitted. The call that answers did my transaction work. Via eth_getTransactionReceipt. $0.005 per call, paid over x402 (USDC).

evm_storage

Reads a raw storage slot of any contract, decoded as hex, integer and address. How you inspect proxy implementation slots, owners and paused flags that have no public getter. Via eth_getStorageAt. $0.005 per call, paid over x402 (USDC).

evm_token_info

Name, symbol, decimals and total supply of any ERC20 contract in one call. Useful to label a token address before showing it to a user. Via eth_call. $0.005 per call, paid over x402 (USDC).

evm_token_price

Spot price of any ERC20 read straight from the deepest Uniswap V3 pool against USDC, on Base, Ethereum, Polygon, Arbitrum or Optimism. Returns the pool address, fee tier, liquidity, sqrtPriceX96, tick and block, so the number can be audited instead of trusted. No aggregator and no API key: the source is the chain itself. Via eth_call. $0.005 per call, paid over x402 (USDC).

evm_token_safety

Pre-trade risk check for any ERC20 on Base, Ethereum, Polygon, Arbitrum or Optimism, straight from the deployed bytecode and live state. Detects mint, pause, blacklist, upgradeable proxy and mutable buy/sell tax powers, and reports whether ownership is renounced. Unlike LLM-written verdicts this returns the EVIDENCE - the exact selector found and its byte offset - so an agent can apply its own policy. Deterministic: same contract, same answer. $0.01 per call, paid over x402 (USDC).

evm_tx

Full transaction details by hash, merged with its receipt: from, to, value, gas used, status and block. One call instead of two. Via eth_getTransactionByHash. $0.005 per call, paid over x402 (USDC).

util

util_address

Validates an EVM address and returns it in EIP-55 mixed-case checksum form. Catches typos before you send funds: an address that fails the checksum is almost always mistyped. $0.0025 per call, paid over x402 (USDC).

util_base64

Base64 in both directions, including the URL-safe alphabet, with UTF-8 handled properly. Encoding is what carries payloads through headers and JSON, and x402 itself rides on it. $0.0025 per call, paid over x402 (USDC).

util_hex

Converts between hex, decimal and UTF-8 text in one call, with big integers handled exactly. For reading raw RPC output, which comes back as hex and overflows a JavaScript number. $0.0025 per call, paid over x402 (USDC).

util_iban

Validates one IBAN offline: country, expected length, ISO 7064 mod-97 check digits, whether it is inside SEPA, and the account number split out. Deterministic, no network call and no third party that can go down. Built for cleaning a list of accounts one at a time. $0.005 per call, paid over x402 (USDC).

util_keccak256

Keccak-256 of any string or hex payload - the hash Ethereum actually uses, which is NOT the same as SHA3-256. Needed for selectors, event topics, salts and CREATE2 addresses. $0.0025 per call, paid over x402 (USDC).

util_phone

Checks one phone number offline: normalises it to E.164, works out its country (including the twelve calling codes shared by several countries, such as +1 US/Canada/Caribbean) and validates the national number length against that country's numbering plan. Returns the tel: URI and the national dialling form. Numbering data from Google's libphonenumber. No network call and no API key, so it cannot fail because a third party is down. $0.005 per call, paid over x402 (USDC).

util_selector

Turns a Solidity signature like transfer(address,uint256) into its 4-byte function selector and its 32-byte event topic0. What you need to build calldata by hand or to filter logs. $0.0025 per call, paid over x402 (USDC).

util_sha256

SHA-256 of any string or hex payload, returned as hex and as base64. The hash everything outside Ethereum uses: file digests, API signatures, content addressing. $0.0025 per call, paid over x402 (USDC).

util_units

Converts between wei, gwei, ether and any token decimals using exact integer maths - no floating point, no silent rounding. The mistake that costs real money is being off by a thousand on decimals. $0.0025 per call, paid over x402 (USDC).

util_uuid

Cryptographically random UUID v4s, up to 100 per call, straight from the platform CSPRNG. For idempotency keys, request ids and correlation ids - the ones that must not collide. $0.0025 per call, paid over x402 (USDC).

util_vat

Validates one EU VAT number offline: country prefix, the format that country uses, and the published check-digit algorithm where one exists. Says explicitly whether the check digits were verified or only the format. Deterministic, no network call. Built for cleaning a list of companies one at a time. $0.005 per call, paid over x402 (USDC).

util_verify_signature

Recovers the address that signed a personal_sign (EIP-191) message and tells you whether it matches the address you expected. This is how you prove a wallet is controlled by whoever is talking to you. $0.0025 per call, paid over x402 (USDC).

content

content_advice

One piece of practical advice about work, life or money, in English or Spanish. Short, concrete and usable - not a fortune cookie. Filterable by topic, with an id to avoid repeats and a seed for reproducibility. $0.0025 per call, paid over x402 (USDC).

content_fact

One curious but true fact, in English or Spanish, filtered by topic: science, computing, history or nature. Takes parameters, returns an id so you can avoid repeats across a session, and accepts a seed for a reproducible answer. $0.0025 per call, paid over x402 (USDC).

content_horror_story

One two-sentence horror story, in English or Spanish, by theme: domestic, technological, cosmic or folk. Returned SPLIT into setup and payoff as well as joined, so a narrating agent can deliver the first line, pause, and then land the second. Takes parameters, returns an id to avoid repeats, and accepts a seed for a reproducible answer. $0.0025 per call, paid over x402 (USDC).

content_joke

One random joke, in English or Spanish, filtered by category: programming, crypto or general. Unlike the usual one-liner endpoints this one takes parameters, returns an id so you can exclude what you have already seen, and accepts a seed for a reproducible answer. $0.0025 per call, paid over x402 (USDC).

content_riddle

One riddle by difficulty, in English or Spanish, with the answer AND the SHA-256 of the answer in lowercase. The hash is the point: an agent can check whether its guess is right without reading the solution first, which no other riddle endpoint lets you do. $0.0025 per call, paid over x402 (USDC).

content_roast

One lighthearted developer roast aimed at a target YOU choose - javascript, python, css, git, regex, kubernetes, agile or legacy code - and at the severity you ask for. Every other roast endpoint returns something generic; this one lets a code-review agent roast the actual stack in front of it. Bilingual, seedable and repeat-free. $0.0025 per call, paid over x402 (USDC).

content_word_of_the_day

The word of the day with its definition, part of speech and an example sentence, in English or Spanish. Genuinely of the day: it is picked deterministically from the UTC date, so everyone gets the same word and you can reproduce any past day by passing it. The usual endpoints just return a random word and call it the word of the day. $0.0025 per call, paid over x402 (USDC).

red

red_asn

Everything the authoritative public sources say about one autonomous system number: the RDAP registry record via the ARIN-to-RIR referral chain (holder, status, allocation dates, abuse contact), the AS name, country and RIR from Team Cymru's DNS service, and the prefixes it is announcing right now in the global routing table, from RIPEstat, split into IPv4 and IPv6 with a sample. Keyless and free at the source. The natural second call after /v1/red/ip gives you an origin ASN. $0.005 per call, paid over x402 (USDC).

red_cert

Every currently valid TLS certificate publicly issued for one domain, read from the Certificate Transparency logs: issuer, validity window, days to expiry, revocation status and every hostname each certificate covers. It reports what was ISSUED, which is how you find certificates you did not know existed - not what the server is serving today. No API key, no account. $0.005 per call, paid over x402 (USDC).

red_dnsbl

Checks one IPv4 address against nine public DNS blocklists at once — SpamCop, UCEPROTECT, PSBL, Barracuda, DroneBL and four more — and returns each list's raw return code plus the reason text the list itself publishes, not a score. Every list is re-checked on each call with its RFC 5782 test entry, so a dead list or one that refuses queries comes back as unavailable instead of reading as clean. Includes the delisting URL for each hit. $0.005 per call, paid over x402 (USDC).

red_domain_check

Everything DNS says about one domain in a single call: whether it is registered, its A and AAAA addresses, nameservers, MX servers, SPF and DMARC, DNSSEC, and whether it looks parked. Built for going through a list of domains one at a time. Live DNS, no API key, no account. $0.005 per call, paid over x402 (USDC).

red_email_check

Scores one email address 0-100 with a verdict (ok, risky, disposable, undeliverable, invalid) and the evidence under it: every point lost is itemised with the field that proves it. 12,141 disposable domains from two maintained open lists pinned to a commit, 4,897 free providers, 1,018 role names, typo fix (gmial.com > gmail.com), live MX/SPF/DMARC. No SMTP probe, no API key. $0.005 per call, paid over x402 (USDC).

red_ip

Looks up one IPv4 or IPv6 address against the two authoritative, keyless public sources: RDAP registry data (who holds the block, in which country, since when, abuse contact) via the ARIN-to-RIR referral chain, and the origin ASN from Team Cymru's DNS service. No city-level geolocation and no VPN/proxy detection — those need a licensed commercial database this endpoint deliberately does not use. Built for going through a list of IPs one at a time. $0.005 per call, paid over x402 (USDC).

red_whois

Registration data for one domain, read from the registry's own RDAP service through the IANA bootstrap — not scraped from port-43 whois text. Returns creation, expiry and last-change dates, age and days to expiry, registrar, EPP status codes, nameservers, DNSSEC and the abuse contact. TLDs with no RDAP server say so instead of reporting the domain as unregistered. No API key, no account. $0.005 per call, paid over x402 (USDC).

random

random_coinflip

Flip one or more fair coins and get heads or tails, with the tally. Cryptographically random, not Math.random. For tie-breaks and A/B splits an agent has to decide on its own. $0.0025 per call, paid over x402 (USDC).

random_dice

Roll dice with any number of faces and get every roll plus the total. Uses the platform CSPRNG with rejection sampling, so every face is equally likely - a plain modulo is biased. Standard dice notation: 3d6, 1d20. $0.0025 per call, paid over x402 (USDC).

random_number

Uniform random integers in any range you give, with or without repeats. Rejection sampling, so the ends of the range are not slightly less likely - which is what happens with modulo. $0.0025 per call, paid over x402 (USDC).

random_password

Generate strong random secrets from the platform CSPRNG, with the entropy in bits so you can judge them. Four alphabets, including one with no look-alike characters for anything a human has to read back. $0.0025 per call, paid over x402 (USDC).

random_pick

Pick one or more items at random from a list you send, with or without repeats. The list is yours, so this is the unbiased chooser an agent needs when it has options and no reason to prefer any. $0.0025 per call, paid over x402 (USDC).

random_shuffle

Shuffle a list into a uniformly random order with Fisher-Yates over the platform CSPRNG. Every permutation is equally likely, which sorting by a random key does not give you. $0.0025 per call, paid over x402 (USDC).

time

time_convert

Convert a time between any two IANA time zones, with daylight saving applied from the runtime's own tz database. Returns both sides with their UTC offset, abbreviation and DST flag, plus the UTC instant and the difference in hours. Warns when the time you asked for does not exist or happens twice because the clocks change that day: the two cases that quietly make a hand-made conversion wrong. $0.0025 per call, paid over x402 (USDC).

time_now

The current time in any IANA time zone, in every form an agent needs at once: ISO with offset, 24-hour, 12-hour, weekday, unix timestamp and UTC. It also says whether daylight saving is active right now and what the zone's standard offset is, so a shifted clock can be told apart from a permanent one. $0.0025 per call, paid over x402 (USDC).

time_zones

Search the full IANA time zone list and get each zone's current UTC offset, abbreviation, local time and DST state. Use it to turn a city or a country into the exact zone name the other endpoints expect, or to find every zone sitting at a given offset right now. $0.0025 per call, paid over x402 (USDC).

weather

weather_forecast

Day-by-day forecast for any point on Earth, up to nine days out, from the Norwegian Meteorological Institute's official model rather than a commercial aggregator. Each day carries its minimum and maximum temperature, total precipitation, strongest wind and the midday symbol, together with the exact model run and the institute's declared units, so a planning decision can cite where the number came from. $0.01 per call, paid over x402 (USDC).

weather_now

Current conditions for any point on Earth, taken from the Norwegian Meteorological Institute's official forecast model rather than a commercial aggregator. Returns temperature, humidity, pressure, wind speed and bearing, cloud cover and the next hour's precipitation, plus the exact model run it came from and the units the institute itself declares, so the figure can be cited and checked instead of merely trusted. $0.01 per call, paid over x402 (USDC).

web

web_read

Fetches one URL and returns the readable page as markdown: title, description, headings, paragraphs and links with their destinations, plus the canonical URL, language and word count. Boilerplate, scripts and navigation are stripped. Built for going through a list of links one at a time. No API key, no account. $0.01 per call, paid over x402 (USDC).

web_status

Checks one URL without downloading the page: HTTP status, the full redirect chain hop by hop with the code of each, the final URL, whether it ends on HTTPS, content type and size, and the security headers the server sends. Built for going through a list of links one at a time. No API key, no account. $0.005 per call, paid over x402 (USDC).

catalog

catalog

FREE, no payment needed. Lists all 65 tools with a real example of the input and of the output each one returns, plus what a call costs and how to pay for it. Call this first if a tool answered HTTP 402.

convert

fx_convert

Converts an amount between any two of the ~30 currencies in the European Central Bank's official reference rates, on today's publication or on a past date within the last 90 days. Returns the rate used, its publication date and whether it was crossed through the euro. This is the auditable rate accounting and customs ask for, not a live market quote: it is published once a day and it is reproducible. $0.005 per call, paid over x402 (USDC).

crypto

crypto_sanctions

Checks one crypto address against the OFAC SDN list published by the US Treasury, across 16 currencies including Ethereum, Bitcoin, Tron and USDT. A hit returns the actual list entry - sanctioned entity, its type and its sanctions programmes - not a risk score. Exact matching only, never fuzzy. Every answer carries the publication date of the list snapshot. No API key, no account. $0.01 per call, paid over x402 (USDC).

image

ai_image

Generates a 1024x1024 JPEG from a text prompt with FLUX.1 [schnell] in about 2 seconds. Returns a hosted image URL valid for 24 hours that you can hand straight to the next tool; add inline=true to also get the base64. Choose 1-8 diffusion steps (default 4). You are only charged if the image is delivered. No API key, no account. $0.01 per call, paid over x402 (USDC).

llm

llm_completion

LLM inference at a flat $1.00 per call, with no account, no API key and no token metering. POST a prompt, get the completion: the same price for 10 tokens or 4000, while metered gateways scale with usage. Automatic failover across several large models; typical response under 1s. Pay per call in USDC over x402 - nothing to sign up for. $1.00 per call, paid over x402 (USDC).

speech

ai_speech

Turns text into natural speech with MeloTTS in English, Spanish, French, Chinese, Japanese or Korean, in about a second. Returns a hosted WAV URL valid for 24 hours plus its size; add inline=true to also get the base64. Up to 2000 characters per call. You are only charged if the audio is delivered. No API key, no account. $0.005 per call, paid over x402 (USDC).

transcribe

ai_transcribe

Transcribes an audio file with Whisper large v3 turbo: pass an https URL (mp3, wav, flac, m4a, ogg, up to 10 MB) or base64 audio in a POST. Returns the text, the detected language with its probability, the duration, and timed segments; add words=true for word-level timestamps. Around 100 languages. You are only charged if the transcript is delivered. No API key, no account. $0.01 per call, paid over x402 (USDC).

Endpoints

URL	Transport	State	Latency	Checked
https://flat-rate-llm.kikoribera03.workers.dev/mcp	streamable-http	answering	216 ms	2 min ago

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X402 Tools — questions

Answers built from our own checks of this server.

What can X402 Tools do?

It exposes 66 tools, read directly from the server on our last check. Among them: ai_image, ai_speech, ai_transcribe, catalog, content_advice, content_fact and 60 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

What is X402 Tools mostly used for?

Its tools cluster around evm, util and content. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.

Is X402 Tools working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 240 ms. The bar chart above shows every period we have measured.

How do I connect X402 Tools?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does X402 Tools need an API key?

No. X402 Tools completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 66 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is X402 Tools?

It answers our handshake in 240 ms on average, which is faster than 59% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.