MCP server

AgentIndex x402 Official

world.agentindex/x402

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Website Source

At a glance

Type

MCP server

Publisher

agentindex.world (verified by the MCP Registry)

Status

Working at last check

Tools

143

Token cost

About 20,503 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.x402]
url = "https://x402.agentindex.world/mcp/"

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"x402":{"type":"http","url":"https://x402.agentindex.world/mcp/"}}}

Antigravity

agy mcp add x402 https://x402.agentindex.world/mcp/

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"x402","server_url":"https://x402.agentindex.world/mcp/","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"x402","server_url":"https://x402.agentindex.world/mcp/"}

Tools

• agent_health ~166 tokens
  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.
• ask_model ~276 tokens
  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
• base_allowance ~142 tokens
  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_basename ~98 tokens
  Resolve a Basename, Base's native ENS-equivalent, to its wallet address via the L2 Basenames resolver.
• base_block ~139 tokens
  Fetch a Base mainnet block header and transaction hashes by number, tag (latest/earliest/safe/finalized), or hash via eth_getBlockByNumber/eth_getBlockByHash.
• base_block-number ~76 tokens
  Latest Base mainnet block height via eth_blockNumber - the current chain tip.
• base_call ~158 tokens
  Generic read-only eth_call against any Base mainnet contract - pass raw calldata, get the raw return data back.
• base_can-sell Moves money · ~173 tokens
  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.
• base_chain-id ~80 tokens
  Base mainnet chain ID (EIP-155) via eth_chainId - confirm which network you're actually talking to.
• base_code ~107 tokens
  Check whether a Base mainnet address is a contract via eth_getCode - returns bytecode size, zero for an externally-owned account.
• base_contract ~105 tokens
  Contract introspection on Base mainnet - is it a contract, bytecode size, best-effort owner(), and whether it's a proxy.
• base_erc1155-balance ~138 tokens
  ERC1155 multi-token balance for a wallet and token id on Base mainnet via balanceOf(address,uint256).
• base_erc20-balance ~120 tokens
  ERC20 token balance for a wallet on Base mainnet - balanceOf() and decimals() batched into one Multicall3 round trip.
• base_erc20-transfers ~147 tokens
  ERC20 Transfer event logs for one token over a Base mainnet block range (max 2,000 blocks) via eth_getLogs.
• base_erc721-tokens ~140 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_estimate-gas ~177 tokens
  Gas estimate for a Base mainnet swap or any other call (to/from/value/data) via eth_estimateGas, without broadcasting a transaction.
• base_events ~210 tokens
  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_live-balance ~138 tokens
  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_network-info ~82 tokens
  Base mainnet network info in one call: chain ID, block height, and current gas price (wei and gwei).
• base_nft-metadata ~134 tokens
  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 ~112 tokens
  Who owns this NFT? ERC721 owner lookup on Base mainnet via ownerOf(tokenId).
• base_nonce ~103 tokens
  Next transaction nonce for any Base mainnet wallet via eth_getTransactionCount - how many transactions it has sent.
• base_pending ~88 tokens
  The current pending Base mainnet block (mempool, not yet mined) - unconfirmed transactions via eth_getBlockByNumber('pending').
• base_proxy ~118 tokens
  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_quote ~166 tokens
  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_receipt ~102 tokens
  Transaction receipt via eth_getTransactionReceipt - status, gas used, and event logs for a mined Base mainnet transaction.
• base_simulate ~160 tokens
  Simulate a Base mainnet transaction before sending it - will it succeed, estimated gas, and the decoded revert reason if it would fail.
• base_storage ~122 tokens
  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_total-supply ~102 tokens
  Total supply for an ERC20 (normalized by decimals()) or ERC721 (raw count, no decimals) contract on Base mainnet.
• base_tx ~105 tokens
  Base transaction lookup by hash - sender, recipient, value, calldata, gas and block, live from Base mainnet via eth_getTransactionByHash.
• can_pay Moves money · ~152 tokens
  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.
• classify ~189 tokens
  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
• company_leads ~300 tokens
  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
• contact_kairos ~224 tokens
  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.
• coordination_thread_schema ~71 tokens
  Return the JSON Schema for coordination thread turns (v1) — free. One structured turn in a multi-agent conversation.
• coordination_thread_snapshot_schema ~78 tokens
  Return the JSON Schema for coordination thread snapshots (v1) — free. Bundle turns, cards and open pledges for handoff between runs.
• crypto ~173 tokens
  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.
• decide ~243 tokens
  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
• detect_language ~96 tokens
  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 ~117 tokens
  Stable SHA-256 digest of an MCP tool_result so agents can verify payloads before settling payment — free, no account.
• discover_mcp_servers ~154 tokens
  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
• discover_semantic ~142 tokens
  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.
• due_diligence ~456 tokens
  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/
• encoding_detect ~115 tokens
  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).
• encoding_transcode ~161 tokens
  Convert text between utf-8, base64, hex, URL-percent-encoding and ascii representations.
• extract_structured ~281 tokens
  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
• fact_check ~160 tokens
  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
• fraction_simplify ~113 tokens
  Simplify a fraction to lowest terms and return its decimal value.
• gas_price ~112 tokens
  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.
• geo_bbox ~150 tokens
  Bounding box (min/max lat and lon) enclosing a list of points.
• geo_bearing ~166 tokens
  Initial compass bearing (0-360 degrees, clockwise from true north) from point 1 to point 2.
• geo_distance ~190 tokens
  Great-circle distance between two lat/lon points (haversine formula). Returns km, mi or nm.
• geo_dms ~236 tokens
  Convert decimal degrees to degrees/minutes/seconds, or DMS back to decimal degrees.
• geo_geohash ~142 tokens
  Encode a lat/lon point into a geohash string (precision 1-12 characters).
• geo_midpoint ~158 tokens
  Geographic (great-circle) midpoint between two lat/lon points.
• geo_point-in-polygon ~231 tokens
  Ray-casting point-in-polygon test (planar approximation - fine for city/region-scale polygons).
• get_agent_trust_kit ~78 tokens
  Return the agent trust kit manifest (v1) — free index of JSON schemas, HTTP validators, MCP tool names and suggested buyer/coordination workflows.
• get_welcome_salon ~83 tokens
  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.
• guard ~248 tokens
  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
• hash_hash ~113 tokens
  Compute an MD5, SHA-1, SHA-256 or SHA-512 hex digest of text.
• hash_hmac ~131 tokens
  Compute an HMAC (MD5, SHA-1, SHA-256 or SHA-512) of text with a given key.
• honest_delivery_refusal_schema ~76 tokens
  Return the JSON Schema for honest delivery refusals (v1) — free. Structured failure record when no tool_result can be delivered.
• intent ~140 tokens
  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.
• jobs ~140 tokens
  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.
• json_diff ~88 tokens
  Recursive diff between two JSON documents: added, removed and changed paths.
• json_flatten ~102 tokens
  Flatten a nested JSON document into single-level dotted-path keys.
• json_query ~91 tokens
  Query a JSON document with a JSONPath expression.
• json_schema-infer ~93 tokens
  Infer a basic JSON Schema (types, object properties, array item type) from an example document.
• json_validate ~102 tokens
  Validate a JSON document against a JSON Schema.
• language ~136 tokens
  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.
• llm_claude_sonnet ~227 tokens
  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 ~236 tokens
  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 ~213 tokens
  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
• mesh_claim_bounty ~139 tokens
  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 ~94 tokens
  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 ~109 tokens
  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_nodes ~96 tokens
  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 ~181 tokens
  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 ~148 tokens
  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.
• money_allocate ~152 tokens
  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.
• money_format ~146 tokens
  Format a numeric amount with thousands separators, a chosen decimal precision and a currency symbol.
• news ~105 tokens
  Top Hacker News headlines right now - title, URL, score, comments. Fresh links for agents that need current tech/startup signal. Try GET /news/sample.
• number_ordinal ~94 tokens
  Convert an integer to its English ordinal form (1st, 2nd, 3rd, 4th, 11th, 21st...).
• number_radix ~138 tokens
  Convert a number's string representation from one base (2-36) to another.
• number_roman ~132 tokens
  Convert an integer (1-3999) to a Roman numeral, or a Roman numeral back to an integer.
• number_words ~90 tokens
  Convert an integer into English words.
• pii_check ~156 tokens
  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
• poll_contact_kairos ~110 tokens
  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.
• probe ~133 tokens
  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.
• rank ~188 tokens
  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.
• read_pdf ~237 tokens
  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 ~170 tokens
  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
• regex_replace ~145 tokens
  Replace regular expression matches in text, with an optional max-replacement count.
• regex_test ~129 tokens
  Test a regular expression against text; returns match status, capture groups and span.
• relationship_memory_schema ~74 tokens
  Return the JSON Schema for portable agent relationship memory cards (v1) — free. Remember interlocutors, not isolated messages.
• research ~225 tokens
  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
• return_visit_pledge_schema ~71 tokens
  Return the JSON Schema for return visit pledges (v1) — free. Commit to come back to a peer or thread by a deadline.
• search ~442 tokens
  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.
• sentiment ~150 tokens
  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.
• spam_check ~124 tokens
  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.
• stats_correlation ~121 tokens
  Pearson correlation coefficient between two equal-length numeric series.
• stats_percentile ~130 tokens
  Nth percentile of a list of numbers (linear interpolation between closest ranks).
• stats_regression ~126 tokens
  Ordinary least squares simple linear regression (y = slope*x + intercept) with R-squared.
• stats_summary ~108 tokens
  Descriptive statistics for a list of numbers: count, mean, median, sample stdev/variance, min, max.
• summarize ~295 tokens
  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.
• text_case ~136 tokens
  Convert text between case styles: snake_case, camelCase, PascalCase, kebab-case, Title Case, CONSTANT_CASE.
• text_diff ~96 tokens
  Unified line diff between two texts, plus an overall similarity ratio (0-1).
• text_readability ~108 tokens
  Flesch Reading Ease and Flesch-Kincaid Grade Level scores for English text (standard public formulas, heuristic syllable counting).
• text_slug ~108 tokens
  Slugify text: strip accents, lowercase, replace non-alphanumerics with a separator.
• time_add ~155 tokens
  Add a fixed duration (days/hours/minutes/seconds) to an ISO 8601 datetime.
• time_between ~110 tokens
  Duration between two ISO 8601 datetimes, as total seconds and a days/hours/minutes/seconds breakdown.
• time_business-days ~105 tokens
  Count weekdays (Mon-Fri) between two dates, inclusive of both endpoints.
• time_convert ~128 tokens
  Convert an ISO 8601 datetime from one IANA timezone to another (handles DST automatically).
• time_format ~102 tokens
  Format an ISO 8601 datetime using a strftime pattern.
• time_humanize ~129 tokens
  Human-readable relative time ('2 hours ago', 'in 3 days') between a datetime and a reference (default now).
• time_iso-week ~88 tokens
  ISO 8601 week number, ISO year and ISO weekday (1=Monday) for a date.
• time_parse ~120 tokens
  Parse a date/time string (ISO 8601 by default, or a given strptime format) into its components.
• token_risk ~204 tokens
  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
• tool_delivery_receipt_schema ~76 tokens
  Return the JSON Schema for portable tool delivery receipts (v1) — free. Link x402 payment metadata to a tool_result SHA-256 digest.
• toxicity ~142 tokens
  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.
• translate ~383 tokens
  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
• unit_convert ~126 tokens
  Convert a value between units of length, mass, volume or temperature (C/F/K).
• validate_coordination_thread_snapshot ~94 tokens
  Validate a coordination thread snapshot against the v1 schema — free. Pass the snapshot object as JSON.
• validate_coordination_thread_turn ~88 tokens
  Validate a coordination thread turn against the v1 schema — free. Pass the turn object as JSON.
• validate_ean ~97 tokens
  EAN-8 or EAN-13 barcode checksum validation (auto-detected by length).
• validate_honest_delivery_refusal ~81 tokens
  Validate an honest delivery refusal against the v1 schema — free.
• validate_iban ~115 tokens
  ISO 13616 IBAN mod-97 checksum validation, with optional BIC (ISO 9362) format check.
• validate_imei ~93 tokens
  IMEI (15-digit mobile device identifier) Luhn checksum validation.
• validate_isbn ~86 tokens
  ISBN-10 or ISBN-13 checksum validation (auto-detected by length).
• validate_isin ~98 tokens
  ISIN (ISO 6166 security identifier) Luhn checksum validation.
• validate_luhn ~100 tokens
  Luhn (mod 10) checksum validation, as used by most payment card numbers.
• validate_relationship_memory ~86 tokens
  Validate a relationship memory card against the v1 schema — free. Pass the card object as JSON.
• validate_return_visit_pledge ~87 tokens
  Validate a return visit pledge against the v1 schema — free. Pass the pledge object as JSON.
• validate_routing ~101 tokens
  US ABA bank routing number (9-digit) checksum validation.
• validate_siret ~120 tokens
  French SIRET (14-digit business establishment number) Luhn checksum validation. Note: the rare La Poste SIREN exception to the standard rule is not applied.
• validate_tool_delivery_receipt ~139 tokens
  Validate a tool delivery receipt against the v1 schema — free. Pass receipt JSON; optional content re-verifies delivery.digest.
• validate_vin ~113 tokens
  North American VIN check-digit validation (NHTSA standard, position 9) plus WMI manufacturer lookup for a small set of known codes.
• verify ~165 tokens
  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.
• verify_tool_result_digest ~134 tokens
  Recompute the canonical digest and return match=true/false — free. Use after a paid tool call to confirm the payload.
• wallet_balance ~166 tokens
  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.
• wallet_intelligence ~236 tokens
  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.
• weather ~202 tokens
  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.
• x402_echo ~137 tokens
  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.

Browse

• Claude tools
• OpenAPI tools
• Web search
• PDF tools
• Converting to Markdown
• APIs and testing

Related MCP servers

• AgentIndex
  Trust scores and on-chain payment receipts for x402 services.
• Agent Tools (x402 pay-per-call)
  URL-to-Markdown ($0.002) and summarization ($0.003), paid per call in USDC on Solana via x402.
• X402 Endpoints
  x402 paid API tools for AI agents on Base: EU/global registries, crypto, wallet & agent trust.
• Agent Toolbox
  Everyday tools for AI agents, paid per call with x402: images, markdown, speech-to-text, embeddings.
• Bob Research Tools
  Paid web research, news, prediction-market evidence, company briefs and fact-checks (x402 USDC)
• Webbersites X402 Data Api
  45 pay-per-call AI agent tools: scraping, SEO, crypto data, lint, agent memory. x402 USDC on Base.
• Skillforge Render API
  Screenshot, PDF, OG-image, and page extraction (markdown/JSON) over MCP. Bearer key or x402.
• AgentIndex
  Search a curated directory of open-source AI agents, MCP servers and AI developer tools.

Badge for your README

[![AptLynx](https://aptlynx.net/badge/world.agentindex/x402.svg)](https://aptlynx.net/servers/world.agentindex/x402)

Listing text is written by the maker; AptLynx lists tools and does not vouch for them. Find another tool · Browse by topic · For agents