x402 pay-per-call data for agents: LLM prices, MCP/x402 directories, holidays, FX, page checks
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Pay-per-call: 25 free/day then $0.001 USDC via x402. One search across ~13,000 agent tools: 4,259 MCP servers (awesome-mcp-servers, MIT) and ~8,900 x402 pay-per-call APIs (nohumans.directory, CC BY 4.0). Filters: q, type=mcp|x402, limit<=100. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
Pay-per-call: 25 free/day then $0.001 USDC via x402. One search across ~13,000 agent tools: 4,259 MCP servers (awesome-mcp-servers, MIT) and ~8,900 x402 pay-per-call APIs (nohumans.directory, CC BY 4.0). Filters: q, type=mcp|x402, limit<=100. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| q* | string | |
| type | string | |
| limit | string |
{
"type": "object",
"required": [
"q"
],
"properties": {
"q": {
"type": "string"
},
"type": {
"enum": [
"mcp",
"x402"
],
"type": "string"
},
"limit": {
"type": "string"
}
}
}Free. Five live public APIs that need no key.
No arguments.
{
"type": "object",
"properties": {}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Search 2,230 link-checked public & free-tier APIs (59 categories). Filters: q, category, auth=none, alive=yes, https=yes, kind, limit<=50. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| q | string | free-text search in name/description/category |
| auth | string | 'none' = no API key |
| kind | string | |
| alive | string | |
| https | string | |
| limit | string | 1-50, default 10 |
| category | string |
{
"type": "object",
"required": [],
"properties": {
"q": {
"type": "string",
"description": "free-text search in name/description/category"
},
"auth": {
"type": "string",
"description": "'none' = no API key"
},
"kind": {
"enum": [
"public_api",
"dev_free_tier",
"ai_api_free_tier"
],
"type": "string"
},
"alive": {
"enum": [
"yes",
"no"
],
"type": "string"
},
"https": {
"enum": [
"yes"
],
"type": "string"
},
"limit": {
"type": "string",
"description": "1-50, default 10"
},
"category": {
"type": "string"
}
}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Live Base mainnet gas price (gwei), latest block, and estimated ETH cost of a USDC transfer (~65k gas) and a plain ETH transfer (21k gas). Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
No arguments.
{
"type": "object",
"required": [],
"properties": {}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Country reference lookup by ISO2/ISO3/name: capital, population, area, continent, currency, phone prefix, TLD, languages, neighbours, time zones with current UTC offset and local time. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| q* | string | ISO2, ISO3 or country name |
{
"type": "object",
"required": [
"q"
],
"properties": {
"q": {
"type": "string",
"description": "ISO2, ISO3 or country name"
}
}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Currency conversion with official ECB euro reference rates (~30 currencies, daily). Params: from, to, amount. Also returns the rate date. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| to* | string | |
| from* | string | |
| amount | string |
{
"type": "object",
"required": [
"from",
"to"
],
"properties": {
"to": {
"type": "string"
},
"from": {
"type": "string"
},
"amount": {
"type": "string"
}
}
}Paid dump ($8 USDC via x402, or buy_with_card in the 402 body). Buy the full Verified API Directory dataset (2,230 rows, JSON, CC BY 4.0 + MIT sources) in one call. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
No arguments.
{
"type": "object",
"required": [],
"properties": {}
}Paid dump ($7 USDC via x402, or buy_with_card in the 402 body). Full dump: Agent Tool Directory, ~13,000 MCP servers + x402 APIs in one unified schema (JSON). MIT + CC BY 4.0 sources, attribution included. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
No arguments.
{
"type": "object",
"required": [],
"properties": {}
}Paid dump ($5 USDC via x402, or buy_with_card in the 402 body). Full dump: list prices of ~3,000 AI models (LiteLLM table, MIT) + verified AI/dev free tiers with limits (JSON). Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
No arguments.
{
"type": "object",
"required": [],
"properties": {}
}Paid dump ($9 USDC via x402, or buy_with_card in the 402 body). Full MCP server directory dump (4,259 servers, JSON). Source awesome-mcp-servers (MIT). Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
No arguments.
{
"type": "object",
"required": [],
"properties": {}
}Paid dump ($6 USDC via x402, or buy_with_card in the 402 body). Full dump: 252 countries (GeoNames, CC BY 4.0), 418 time zones, ~14,000 public holidays 2026-2027 (python-holidays, MIT). JSON. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
No arguments.
{
"type": "object",
"required": [],
"properties": {}
}Paid dump ($6 USDC via x402, or buy_with_card in the 402 body). Full dump: ~8,900 x402 pay-per-call APIs with category, price, chains and probe status (JSON). Data from nohumans.directory, CC BY 4.0, attribution required. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
No arguments.
{
"type": "object",
"required": [],
"properties": {}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Email address check WITHOUT sending mail or SMTP probing: RFC-style syntax check, domain MX/A records via DNS-over-HTTPS, disposable-domain flag (CC0 blocklist, ~9,900 domains), role-address flag (info@, support@...), free-mail flag. Verdict: deliverable_domain | risky | invalid. Cannot confirm that the mailbox itself exists. Addresses are not stored or logged. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| email* | string | one email address |
{
"type": "object",
"required": [
"email"
],
"properties": {
"email": {
"type": "string",
"description": "one email address"
}
}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Messy text + JSON Schema in, clean JSON out. Uses a small LLM (Cloudflare Workers AI, Llama 3.1 8B, JSON mode) when available, else a deterministic key:value/regex extractor; the result is type-checked against your schema and missing fields are null. Limits: text <= 6,000 chars, schema <= 30 top-level properties (flat objects, arrays of scalars); the model can misread ambiguous text, so check important values. Params: text, schema (JSON string), mode=auto|heuristic. GET query or POST JSON body. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| mode | string | |
| text* | string | input text, max 6000 chars |
| schema* | string | JSON Schema (type object with properties) as a JSON string |
{
"type": "object",
"required": [
"text",
"schema"
],
"properties": {
"mode": {
"enum": [
"auto",
"heuristic"
],
"type": "string"
},
"text": {
"type": "string",
"description": "input text, max 6000 chars"
},
"schema": {
"type": "string",
"description": "JSON Schema (type object with properties) as a JSON string"
}
}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Current free-tier limits for developer services (hosting, DB, auth, email, CI, monitoring) and AI/LLM APIs, with official source URLs. Filter: q, category. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| q | string | |
| category | string |
{
"type": "object",
"required": [],
"properties": {
"q": {
"type": "string"
},
"category": {
"type": "string"
}
}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Public holidays for ~490 countries/territories for 2026 and 2027; optional date=YYYY-MM-DD answers is_holiday. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| date | string | |
| year | string | |
| country* | string | ISO2 |
{
"type": "object",
"required": [
"country"
],
"properties": {
"date": {
"type": "string"
},
"year": {
"enum": [
"2026",
"2027"
],
"type": "string"
},
"country": {
"type": "string",
"description": "ISO2"
}
}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Check up to 20 URLs in one call: HTTP status, final URL after redirects, redirect count, latency, content-type, ok flag. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| urls* | string | comma-separated absolute URLs, max 20 |
{
"type": "object",
"required": [
"urls"
],
"properties": {
"urls": {
"type": "string",
"description": "comma-separated absolute URLs, max 20"
}
}
}Free. List every FreeTier Agent API endpoint with price (25 free calls/day then $0.001 USDC via x402 on pay-per-call routes; dumps $5–$9), description and example query.
No arguments.
{
"type": "object",
"properties": {}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Token & cost calculator: estimate tokens for a text (or pass input_tokens/output_tokens) and price it across several models using provider list prices (LiteLLM price table, MIT). Params: models (comma list of model ids like gpt-4o-mini, claude-sonnet-4-5, gemini/gemini-2.5-flash or search words, max 15), text or input_tokens, output_tokens, calls. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| text | string | |
| calls | string | |
| models | string | |
| input_tokens | string | |
| output_tokens | string |
{
"type": "object",
"required": [],
"properties": {
"text": {
"type": "string"
},
"calls": {
"type": "string"
},
"models": {
"type": "string"
},
"input_tokens": {
"type": "string"
},
"output_tokens": {
"type": "string"
}
}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. AI model list prices (USD per 1M input/output/cached tokens, context window, vision/tools/reasoning flags) for ~3,000 models across OpenAI, Anthropic, Google, Mistral, Groq, Bedrock, Azure, Together, Fireworks and more, plus verified free tiers/rate limits of AI APIs. Filters: q, provider, free=yes, max_input_per_m, min_context, vision=yes, tools=yes, sort=input|output|context, limit<=100. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| q | string | |
| free | string | |
| sort | string | |
| limit | string | |
| tools | string | |
| vision | string | |
| provider | string | |
| min_context | string | |
| max_input_per_m | string |
Free. List prices of five popular LLMs (USD per 1M tokens, LiteLLM table, MIT).
No arguments.
{
"type": "object",
"properties": {}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Search 4,259 MCP (Model Context Protocol) servers by keyword, category, language (python/typescript/go/rust...), scope (cloud/local) and official flag. Returns repo URL and description. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| q | string | |
| limit | string | |
| scope | string | |
| category | string | |
| language | string | |
| official | string |
{
"type": "object",
"required": [],
"properties": {
"q": {
"type": "string"
},
"limit": {
"type": "string"
},
"scope": {
"enum": [
"cloud",
"local",
"embedded"
],
"type": "string"
},
"category": {
"type": "string"
},
"language": {
"type": "string"
},
"official": {
"enum": [
"yes"
],
"type": "string"
}
}
}Free. Five sample MCP servers from the 4,259-server directory (MIT source).
No arguments.
{
"type": "object",
"properties": {}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. One-call page audit for agents: HTTP status, redirects, latency, title, meta description, canonical, lang, Open Graph, JSON-LD types, headings, word count, plus agent-friendliness: robots.txt rules for 14 AI crawlers, llms.txt, sitemap, and a 0-100 score with reasons. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| url* | string |
{
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string"
}
}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Convert a public web page to clean Markdown (title, headings, paragraphs, lists, links, code), scripts/nav/footer removed, max ~60k chars. robots.txt respected. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| url* | string |
{
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string"
}
}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Fetch a public web page (robots.txt respected) and return title, meta description, canonical, Open Graph/Twitter tags, language, headings, link counts, HTTP status. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| url* | string | absolute http(s) URL |
{
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"description": "absolute http(s) URL"
}
}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Check whether a URL may be crawled per the site's robots.txt for a given user-agent. Returns allowed, matched rule, crawl-delay, sitemaps. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| ua | string | user-agent token, default * |
| url* | string | absolute http(s) URL |
{
"type": "object",
"required": [
"url"
],
"properties": {
"ua": {
"type": "string",
"description": "user-agent token, default *"
},
"url": {
"type": "string",
"description": "absolute http(s) URL"
}
}
}Pay-per-call: 25 free/day then $0.001 USDC via x402. Search ~8,900 live x402 pay-per-call APIs (verified/unverified by nohumans.directory probes, CC BY 4.0): name, endpoint URL, category, price, chains, status, score. Filters: q, category, chain, max_price, status=verified, limit<=100. Calling this tool returns the HTTP request and x402 payment requirements (or use the free quota).
| Argument | Type | Description |
|---|---|---|
| q | string | |
| chain | string | |
| limit | string | |
| status | string | |
| category | string | |
| max_price | string |
{
"type": "object",
"required": [],
"properties": {
"q": {
"type": "string"
},
"chain": {
"type": "string"
},
"limit": {
"type": "string"
},
"status": {
"enum": [
"verified",
"unverified"
],
"type": "string"
},
"category": {
"type": "string"
},
"max_price": {
"type": "string"
}
}
}{
"type": "object",
"required": [],
"properties": {
"q": {
"type": "string"
},
"free": {
"enum": [
"yes"
],
"type": "string"
},
"sort": {
"enum": [
"input",
"output",
"context"
],
"type": "string"
},
"limit": {
"type": "string"
},
"tools": {
"enum": [
"yes"
],
"type": "string"
},
"vision": {
"enum": [
"yes"
],
"type": "string"
},
"provider": {
"type": "string"
},
"min_context": {
"type": "string"
},
"max_input_per_m": {
"type": "string"
}
}
}