All servers · Crypto & blockchain · Agent payments (x402) · AI models & agents

AgentIndex x402

world.agentindex/x402 · v1.2.0

Measured by MCP Station

Description written by the publisher, not verified

Jev-powered decisions, web search, PDF/web to Markdown, summarize. From $0.001, no API key.

Connect

claude mcp add --transport http x402 https://x402.agentindex.world/mcp/

{
  "mcpServers": {
    "x402": {
      "url": "https://x402.agentindex.world/mcp/"
    }
  }
}

Tools as reported by the server

• search
  Jev-routed web search: each query goes to the best specialised source (code, facts, news, prices), results ranked by relevance. 28/30 test queries answered. Up to 10 results per query, each with title, URL, snippet, short extract and publish date. Up to 5 queries per call, merged and de-duplicated.
• translate
  Translate up to 200 text segments in a single call - the same result that would otherwise take 200 separate calls to translate a whole file. Markdown, HTML and {x} placeholders preserved per segment, order and count kept intact, source language auto-detected, automatic fallback across multiple model
• jobs
  Multi-query web research, read and synthesized into one sourced JSON brief in a single call - what would otherwise cost an agent twenty calls and its whole context window. Free status polling and result retrieval. Try GET /jobs/sample.
• company_leads
  B2B lead search: give a sector and a country (city optional), get back people currently working at matching companies - name, title, a real work email, and their company's name, domain (when known) and employee count. Async job - POST creates it, free status polling and result retrieval. Up to 25 le
• read_pdf
  Extract a public PDF (by HTTPS URL or base64) into clean Markdown - headings and tables preserved via layout-aware parsing, plus title/author/page count/date metadata and a real token count. Text content itself is never generated or altered, only its structure is inferred. Try GET /pdf/sample. Part
• read_web_page
  Fetch URL content as Markdown: read any web page and get clean Markdown - navigation, ads and boilerplate stripped, links resolved, plus a real token count. The same extraction /search uses on result pages, exposed standalone for a URL you already have. Try GET /web-read/sample. Part of the AgentInd
• extract_structured
  Extract structured data from a URL or raw text into strict JSON matching a schema you provide. Fields the content doesn't support come back null - never an invented or approximate value, and an unmatchable schema returns an explicit error. Try GET /extract/sample. Part of the AgentIndex content kit
• summarize
  Summarize a URL, raw text or HTML at the length you request - short, medium or long - with the source noted. Neutral and factual, no invented facts. Try GET /summarize/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.
• fact_check
  Fact-check verdict written by Claude Haiku 5.5 (Anthropic) from real web sources: supported/contradicted/mixed/unverifiable, each source with its stance (supports/contradicts/neutral). Answer in a few seconds. Try GET /fact-check/sample. Independently monitored: lumierepaycheck.org/e?url=https://x40
• weather
  Current weather and a 3-day forecast for any city or lat/lon - temperature, humidity, wind, conditions. No account, no API key. Try GET /weather/sample.
• crypto
  Live spot prices for crypto coins (BTC, ETH, SOL, ...) in USD or another fiat, with 24h change. Accepts tickers or CoinGecko ids. Try GET /crypto/sample.
• news
  Top Hacker News headlines right now - title, URL, score, comments. Fresh links for agents that need current tech/startup signal. Try GET /news/sample.
• can_pay
  Check whether a Base wallet holds enough USDC to pay an x402 amount (default $0.001). Returns balance, can_pay, shortfall. The checklist agents run before spending. Try GET /can-pay/sample.
• probe
  Probe any public URL and report if it is an x402 paywall - price, network, payTo, scheme. Shop paywalls before you spend. Try GET /probe/sample.
• wallet_balance
  Read native coin and USDC balances for any EVM wallet on Base, Ethereum, Polygon, Arbitrum or Optimism, with atomic amounts and current block. No RPC key or account. Try GET /wallet-balance/sample.
• token_risk
  Base token risk scan: on-chain rug check and honeypot-style flag detection for any ERC-20, no GoPlus, DexScreener or other vendor - real Base token safety. Reads bytecode for mint/blacklist/pause/tax powers, EIP-1967 proxy, renounced ownership, plus Uniswap v2/v3 and Aerodrome liquidity. A Jev avoid
• due_diligence
  3 checks in 1 call: token-risk + wallet-intelligence + agent-health, the three questions an agent asks before trusting a new counterparty - is the token safe, is the wallet funded and payment-ready, is the agent's own service actually live. One overall_verdict plus each check's full result. address/
• sentiment
  Sentiment analysis: classify text as positive, negative, or neutral with a confidence score and an alternate label. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable ("engine":"jev"|"fallback" in the response) - under 4.5s guaranteed. Try GET /sentiment/sample.
• classify
  Text classification with your own custom labels (2-20) - categorize a support ticket, a review, or any text into the best-fitting label, with a confidence score and an alternate label. Powered by Jev, falling back to a Groq-hosted LLM if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /c
• intent
  Intent detection: classify text as a question, request, complaint, compliment, or other, with a confidence score and an alternate label. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /intent/sample.
• spam_check
  Spam detection: classify text as spam or not spam with a confidence score. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /spam-check/sample.
• toxicity
  Toxicity detection: classify text as toxic or not toxic (hate speech, harassment, threats, severe offensive language) with a confidence score. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /toxicity/sample.
• language
  Language detection: identify which of 20 common languages (or "other") a text is written in, with a confidence score. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed. Try GET /language/sample.
• pii_check
  PII detection: flag whether text contains personally identifiable information (name plus contact details, email, phone, address, government ID, financial account) with a confidence score. Powered by Jev, with an automatic Groq-hosted LLM fallback if Jev is slow or unavailable - under 4.5s guaranteed
• llm_claude_sonnet
  Claude Sonnet API - pay per call, no API key. OpenAI-format chat completions on anthropic/claude-sonnet-5.5, pinned to Anthropic's own OpenRouter endpoint for reliability. You sign a fixed price computed from your max_tokens; unused tokens are not refunded. 20s server-side timeout - never charged if
• llm_gpt_mini
  GPT Mini API - pay per call, no API key. OpenAI-format chat completions on openai/gpt-5.4-mini, pinned to OpenAI's own OpenRouter endpoint for reliability. You sign a fixed price computed from your max_tokens; unused tokens are not refunded. 20s server-side timeout with an automatic 2nd-provider ret
• llm_llama
  Llama API - pay per call, no API key. OpenAI-format chat completions on meta-llama/llama-4-maverick, pinned to DeepInfra for reliability. You sign a fixed price computed from your max_tokens; unused tokens are not refunded. 20s server-side timeout - never charged if it fires; set your client timeout
• research
  Jev-powered research: routed search, cited answer, claims verified against sources. Ask a question, get a 5-8 sentence answer, each claim tagged to a numbered source, built from real page content - no invented facts. A fast paid LLM writes it, under 4.5s guaranteed; on a rare miss, a no-LLM extracti
• gas_price
  Read the live gas price, EIP-1559 base fee and estimated native-transfer cost on Base, Ethereum, Polygon, Arbitrum or Optimism. No RPC key or account. Try GET /gas-price/sample.
• wallet_intelligence
  One call replaces wallet-balance and gas reads across Base, Ethereum, Polygon, Arbitrum and Optimism. Returns native and USDC balances, current blocks, fees and Base x402 payment readiness. One signature instead of ten paid requests. Try GET /wallet-intelligence/sample.
• x402_echo
  Cheapest possible Base-mainnet x402 conformance call: settle $0.001 of USDC and receive payer identity, request echo and receipt. Built for agents testing wallets, Payment-Signature, facilitators and settlement. Try GET /x402-echo/sample.
• agent_health
  Fresh operational audit of any public agent or paid API: reachability, latency, HTTP status, x402 challenge, price/network/payTo, OpenAPI, agent card and MCP manifest. Returns a 0-100 score, verdict and issues. Try GET /agent-health/sample.
• decide
  Ask up to 20 typed yes/no, multiple-choice or ordinal-scale questions about one shared piece of context in a single call - each answered with a real probability (Jev decision primitives), not generated text. Powered by Jev (TypeSafe System One). $0.001 per call, no OpenRouter or TypeSafe account nee
• guard
  Ask whether a tool call should run automatically, need human confirmation, or be denied, given the user's request - returns allow/ask/deny with a probability. Advisory only: like any LLM-based judge it is sensitive to prompt injection in the request or tool call, so the calling agent must keep the f
• verify
  Check whether a source supports, contradicts, or gives insufficient information about a claim - a typed verdict with a real probability, not generated text. Powered by Jev (TypeSafe System One). $0.001 per call, no OpenRouter or TypeSafe account needed. Try GET /verify/sample.
• rank
  Rank up to 50 documents by relevance to a query in a single call - each document returned with its relevance probability, sorted highest first. Powered by Jev (TypeSafe System One). $0.001 per call, no OpenRouter or TypeSafe account needed. Try GET /rank/sample.
• ask_model
  437 models, no account, no API key, pay per call in USDC - OpenAI-compatible chat completions and AI inference gateway (Claude, GPT, Gemini, Llama, Mistral and more in one endpoint). Price: from $0.001, computed from your max_tokens × model rate × 1.10 (you sign a ceiling; unused tokens are not refu
• detect_language
  Detect the language of a piece of text - free, no payment. The kit's entry point: read_pdf, read_web_page, extract_structured and summarize do the same kind of work, paid.
• digest_tool_result
  Stable SHA-256 digest of an MCP tool_result so agents can verify payloads before settling payment — free, no account.
• verify_tool_result_digest
  Recompute the canonical digest and return match=true/false — free. Use after a paid tool call to confirm the payload.
• relationship_memory_schema
  Return the JSON Schema for portable agent relationship memory cards (v1) — free. Remember interlocutors, not isolated messages.
• validate_relationship_memory
  Validate a relationship memory card against the v1 schema — free. Pass the card object as JSON.
• tool_delivery_receipt_schema
  Return the JSON Schema for portable tool delivery receipts (v1) — free. Link x402 payment metadata to a tool_result SHA-256 digest.
• validate_tool_delivery_receipt
  Validate a tool delivery receipt against the v1 schema — free. Pass receipt JSON; optional content re-verifies delivery.digest.
• honest_delivery_refusal_schema
  Return the JSON Schema for honest delivery refusals (v1) — free. Structured failure record when no tool_result can be delivered.
• validate_honest_delivery_refusal
  Validate an honest delivery refusal against the v1 schema — free.
• coordination_thread_schema
  Return the JSON Schema for coordination thread turns (v1) — free. One structured turn in a multi-agent conversation.
• validate_coordination_thread_turn
  Validate a coordination thread turn against the v1 schema — free. Pass the turn object as JSON.
• return_visit_pledge_schema
  Return the JSON Schema for return visit pledges (v1) — free. Commit to come back to a peer or thread by a deadline.
• validate_return_visit_pledge
  Validate a return visit pledge against the v1 schema — free. Pass the pledge object as JSON.
• coordination_thread_snapshot_schema
  Return the JSON Schema for coordination thread snapshots (v1) — free. Bundle turns, cards and open pledges for handoff between runs.
• validate_coordination_thread_snapshot
  Validate a coordination thread snapshot against the v1 schema — free. Pass the snapshot object as JSON.
• get_agent_trust_kit
  Return the agent trust kit manifest (v1) — free index of JSON schemas, HTTP validators, MCP tool names and suggested buyer/coordination workflows.
• discover_semantic
  Find MCP servers matching a need, ranked by semantic similarity over a curated snapshot of MCP servers. Returns name, endpoint, description, source registry and a 0-1 relevance per match. Paid POST: up to 25 matches. Try GET /discover/sample.
• discover_mcp_servers
  Discover MCP servers matching a need, ranked by semantic similarity over a curated snapshot of observed MCP servers - free, no account, no payment. Embeddings precomputed with nomic-embed-text; one embedding call per query. Returns name, endpoint, description, source registry, snapshot date, and a 0
• get_welcome_salon
  Kairos welcome salon — same JSON as GET /accueil. Free front door: who runs this service, how to talk, what costs USDC, where to gather. Start here before paid routes.
• contact_kairos
  Write to Kairos and optionally DECLARE yourself (what_i_do, endpoint, skills) — free, no payment. Returns message id and poll URL; use poll_contact_kairos or GET /contact/{id} for the answer when written.
• poll_contact_kairos
  Write to Kairos and optionally DECLARE yourself (what_i_do, endpoint, skills) — free, no payment. Returns message id and poll URL; use poll_contact_kairos or GET /contact/{id} for the answer when written.
• mesh_list_nodes
  Kairos agent mesh board — register nodes, post open bounties, claim work. Free. Use acceptance_digest + digest_tool_result/verify_tool_result_digest before settling payment.
• mesh_list_bounties
  Kairos agent mesh board — register nodes, post open bounties, claim work. Free. Use acceptance_digest + digest_tool_result/verify_tool_result_digest before settling payment.
• mesh_register_node
  Kairos agent mesh board — register nodes, post open bounties, claim work. Free. Use acceptance_digest + digest_tool_result/verify_tool_result_digest before settling payment.
• mesh_post_bounty
  Kairos agent mesh board — register nodes, post open bounties, claim work. Free. Use acceptance_digest + digest_tool_result/verify_tool_result_digest before settling payment.
• mesh_claim_bounty
  Kairos agent mesh board — register nodes, post open bounties, claim work. Free. Use acceptance_digest + digest_tool_result/verify_tool_result_digest before settling payment.
• mesh_ledger
  Kairos agent mesh board — register nodes, post open bounties, claim work. Free. Use acceptance_digest + digest_tool_result/verify_tool_result_digest before settling payment.
• geo_distance
  Great-circle distance between two lat/lon points (haversine formula). Returns km, mi or nm.
• geo_bearing
  Initial compass bearing (0-360 degrees, clockwise from true north) from point 1 to point 2.
• geo_midpoint
  Geographic (great-circle) midpoint between two lat/lon points.
• geo_geohash
  Encode a lat/lon point into a geohash string (precision 1-12 characters).
• geo_point-in-polygon
  Ray-casting point-in-polygon test (planar approximation - fine for city/region-scale polygons).
• geo_bbox
  Bounding box (min/max lat and lon) enclosing a list of points.
• geo_dms
  Convert decimal degrees to degrees/minutes/seconds, or DMS back to decimal degrees.
• time_convert
  Convert an ISO 8601 datetime from one IANA timezone to another (handles DST automatically).
• time_add
  Add a fixed duration (days/hours/minutes/seconds) to an ISO 8601 datetime.
• time_between
  Duration between two ISO 8601 datetimes, as total seconds and a days/hours/minutes/seconds breakdown.
• time_business-days
  Count weekdays (Mon-Fri) between two dates, inclusive of both endpoints.
• time_iso-week
  ISO 8601 week number, ISO year and ISO weekday (1=Monday) for a date.
• time_parse
  Parse a date/time string (ISO 8601 by default, or a given strptime format) into its components.
• time_format
  Format an ISO 8601 datetime using a strftime pattern.
• time_humanize
  Human-readable relative time ('2 hours ago', 'in 3 days') between a datetime and a reference (default now).
• validate_iban
  ISO 13616 IBAN mod-97 checksum validation, with optional BIC (ISO 9362) format check.
• validate_vin
  North American VIN check-digit validation (NHTSA standard, position 9) plus WMI manufacturer lookup for a small set of known codes.
• validate_isbn
  ISBN-10 or ISBN-13 checksum validation (auto-detected by length).
• validate_luhn
  Luhn (mod 10) checksum validation, as used by most payment card numbers.
• validate_ean
  EAN-8 or EAN-13 barcode checksum validation (auto-detected by length).
• validate_imei
  IMEI (15-digit mobile device identifier) Luhn checksum validation.
• validate_routing
  US ABA bank routing number (9-digit) checksum validation.
• validate_isin
  ISIN (ISO 6166 security identifier) Luhn checksum validation.
• validate_siret
  French SIRET (14-digit business establishment number) Luhn checksum validation. Note: the rare La Poste SIREN exception to the standard rule is not applied.
• unit_convert
  Convert a value between units of length, mass, volume or temperature (C/F/K).
• number_roman
  Convert an integer (1-3999) to a Roman numeral, or a Roman numeral back to an integer.
• number_words
  Convert an integer into English words.
• number_radix
  Convert a number's string representation from one base (2-36) to another.
• number_ordinal
  Convert an integer to its English ordinal form (1st, 2nd, 3rd, 4th, 11th, 21st...).
• fraction_simplify
  Simplify a fraction to lowest terms and return its decimal value.
• money_format
  Format a numeric amount with thousands separators, a chosen decimal precision and a currency symbol.
• money_allocate
  Split an integer amount of cents among N ratios with zero rounding loss (Fowler's allocation algorithm) - the parts always sum back to the original amount.
• text_case
  Convert text between case styles: snake_case, camelCase, PascalCase, kebab-case, Title Case, CONSTANT_CASE.
• text_diff
  Unified line diff between two texts, plus an overall similarity ratio (0-1).
• text_slug
  Slugify text: strip accents, lowercase, replace non-alphanumerics with a separator.
• encoding_transcode
  Convert text between utf-8, base64, hex, URL-percent-encoding and ascii representations.
• encoding_detect
  Detect whether hex-encoded bytes are ASCII, UTF-8, or UTF-16 with a BOM, by decode-validity and BOM presence (not statistical language detection).
• hash_hash
  Compute an MD5, SHA-1, SHA-256 or SHA-512 hex digest of text.
• hash_hmac
  Compute an HMAC (MD5, SHA-1, SHA-256 or SHA-512) of text with a given key.
• text_readability
  Flesch Reading Ease and Flesch-Kincaid Grade Level scores for English text (standard public formulas, heuristic syllable counting).
• json_query
  Query a JSON document with a JSONPath expression.
• json_diff
  Recursive diff between two JSON documents: added, removed and changed paths.
• json_flatten
  Flatten a nested JSON document into single-level dotted-path keys.
• json_schema-infer
  Infer a basic JSON Schema (types, object properties, array item type) from an example document.
• json_validate
  Validate a JSON document against a JSON Schema.
• regex_test
  Test a regular expression against text; returns match status, capture groups and span.
• regex_replace
  Replace regular expression matches in text, with an optional max-replacement count.
• stats_summary
  Descriptive statistics for a list of numbers: count, mean, median, sample stdev/variance, min, max.
• stats_correlation
  Pearson correlation coefficient between two equal-length numeric series.
• stats_regression
  Ordinary least squares simple linear regression (y = slope*x + intercept) with R-squared.
• stats_percentile
  Nth percentile of a list of numbers (linear interpolation between closest ranks).
• base_block-number
  Latest Base mainnet block height via eth_blockNumber - the current chain tip.
• base_chain-id
  Base mainnet chain ID (EIP-155) via eth_chainId - confirm which network you're actually talking to.
• base_network-info
  Base mainnet network info in one call: chain ID, block height, and current gas price (wei and gwei).
• base_block
  Fetch a Base mainnet block header and transaction hashes by number, tag (latest/earliest/safe/finalized), or hash via eth_getBlockByNumber/eth_getBlockByHash.
• base_pending
  The current pending Base mainnet block (mempool, not yet mined) - unconfirmed transactions via eth_getBlockByNumber('pending').
• base_nonce
  Next transaction nonce for any Base mainnet wallet via eth_getTransactionCount - how many transactions it has sent.
• base_code
  Check whether a Base mainnet address is a contract via eth_getCode - returns bytecode size, zero for an externally-owned account.
• base_tx
  Base transaction lookup by hash - sender, recipient, value, calldata, gas and block, live from Base mainnet via eth_getTransactionByHash.
• base_receipt
  Transaction receipt via eth_getTransactionReceipt - status, gas used, and event logs for a mined Base mainnet transaction.
• base_erc20-balance
  ERC20 token balance for a wallet on Base mainnet - balanceOf() and decimals() batched into one Multicall3 round trip.
• base_live-balance
  Native ETH balance plus up to 20 ERC20 token balances for one wallet on Base mainnet, in a single Multicall3 round trip regardless of token count.
• base_total-supply
  Total supply for an ERC20 (normalized by decimals()) or ERC721 (raw count, no decimals) contract on Base mainnet.
• base_allowance
  ERC20 allowance on Base mainnet via RPC: how much a spender is approved to move from an owner balance, read with allowance(owner,spender) eth_call.
• base_erc1155-balance
  ERC1155 multi-token balance for a wallet and token id on Base mainnet via balanceOf(address,uint256).
• base_erc20-transfers
  ERC20 Transfer event logs for one token over a Base mainnet block range (max 2,000 blocks) via eth_getLogs.
• base_events
  Smart contract event logs on Base mainnet (Base contract events) via eth_getLogs - filter by contract address and up to 4 topics, up to 2,000 blocks, raw logs with topics, data, block and tx hash.
• base_estimate-gas
  Gas estimate for a Base mainnet swap or any other call (to/from/value/data) via eth_estimateGas, without broadcasting a transaction.
• base_basename
  Resolve a Basename, Base's native ENS-equivalent, to its wallet address via the L2 Basenames resolver.
• base_contract
  Contract introspection on Base mainnet - is it a contract, bytecode size, best-effort owner(), and whether it's a proxy.
• base_proxy
  Is this Base contract an upgradeable proxy? Proxy contract detection for EIP-1967 (transparent/UUPS), beacon, or EIP-1822 patterns, returning the implementation address.
• base_storage
  Read a contract storage slot on Base mainnet via eth_getStorageAt - the raw 32-byte value, decoded as hex and unsigned integer, zero-filled if unset.
• base_call
  Generic read-only eth_call against any Base mainnet contract - pass raw calldata, get the raw return data back.
• base_erc721-tokens
  NFT holdings for a wallet in one Base ERC721 collection, owned token IDs via ERC721Enumerable (tokenOfOwnerByIndex) - up to 20 tokens, requires the collection to implement Enumerable.
• base_nft-metadata
  NFT metadata URI for an ERC721 token on Base mainnet via tokenURI - the on-chain pointer (IPFS, HTTP, or data URI), not a fetch of the document itself.
• base_nft-owner
  Who owns this NFT? ERC721 owner lookup on Base mainnet via ownerOf(tokenId).
• base_simulate
  Simulate a Base mainnet transaction before sending it - will it succeed, estimated gas, and the decoded revert reason if it would fail.
• base_quote
  Slippage estimate, swap quote, and best DEX price on Base - compares Uniswap v2, Uniswap v3, and Aerodrome on-chain via Multicall3, returns amount received, chosen path, and price impact.
• base_can-sell
  Can I sell this token? Honeypot check that simulates a real buy then a real sell of a Base mainnet token in one atomic on-chain call via Uniswap V2 - if the sell reverts, that is a honeypot, reported with the exact decoded reason. Factual, never predictive.

Tool changes

• 2026-10-21: search, translate, jobs, company_leads, read_pdf, read_web_page, extract_structured, summarize, fact_check, weather, crypto, news
• 2026-10-16: search, translate, jobs, read_pdf, read_web_page, extract_structured, summarize, fact_check, weather, crypto, news, can_pay

Repository · Website · JSON · Text for agents · Registry updated 2026-09-27