Every agent-payable API.

AI agent tool change detector API (MCP tool diff). Compare an agent tool list now (tools array or public remote MCP URL) with a pin from an earlier ToolFit call (or a baseline array): removed or added tools, changed descriptions with a word diff and new poisoning findings, removed or newly required params, type and enum changes, annotation changes. Verdict: unchanged, compatible, review, suspicious or breaking.

Full AI agent tool schema audit API (MCP and function calling). Full audit of an agent tool list (tools array or public remote MCP URL): every schema issue per provider (OpenAI, Anthropic, Gemini, Bedrock, MCP; strict mode opt-in) with JSON path and source link, rewritten definitions per provider, confusable tool pairs with distinguishing terms and fix hints, description and poisoning lints, per-tool fingerprints and a pin.

AI agent tool schema linter API (MCP and function calling). Check an agent tool list (tools array or public remote MCP URL): grade A-F,

MCP server checker API. Preflight a public remote MCP server before connecting or paying: does it answer an MCP initialize, which protocol version, sign-in method (OAuth metadata), x402 payment terms, latency, tool count, token cost, provider compatibility, poisoning patterns in tools and instructions, and a grade with issues. Lists tools only, never calls them. Blocked or unresolvable URLs are never charged.

Find the paid x402 API for a task: top 5 resources from the merged public x402 discovery indexes, ranked by relevance to your need, index-reported 30-day payers and calls, recency and price. Each result: service, resource URL, method, description, USDC price, networks, 30-day calls and payers, repeat_buyers, last called time. Filters: max_price, network, min_payers. No live check (use /v1/pick). No matches: 404, never charged.

x402 API market data report. Market report for sellers and builders: for a category (need, e.g. token safety) or the whole x402 index, resource and seller-host counts, hosts with 3+ payers, listed price quartiles, the price where buyers are (payer-weighted median), 30-day calls, estimated 30-day revenue (calls x price, an upper bound), top sellers and the resources with most payers. Use it to price a new endpoint or test a niche for paying demand. limit 1-25 (default 10).

API finder for AI agents (live-checked). Pick the paid x402 API to call: top 10 ranked resources for your need (relevance, 30-day payers and calls, recency, price; filters), a live check of the top 5 (one unpaid request each, 3 s timeout: 402 with x402 terms, live price and networks, matches the listing?), the best verified pick, the cheapest verified alternative and category price stats. Fail-closed: a failed check is never called verified; none verified means best_pick null, low confidence.

Tool selection API for AI agents (tool routing). Pick the tools an agent needs for a task from a large tool list: send set_id (from the free /v1/register) or tools, plus the task. Returns a ranked shortlist (adaptive 3-12, or k), confidence, matched terms, token savings and the definitions in MCP, OpenAI, Anthropic or Gemini form. BM25, no LLM. Unknown set_id: 404, never charged.

Validate the format and supported check-digit rules of tax IDs across Latin America and Spain: Chile RUT, Argentina CUIT/CUIL, Brazil CPF/CNPJ, Mexico RFC, Peru RUC, Colombia NIT, Spain NIF/NIE. Does not verify identity or registration with a tax authority. Use when checking a Latin American or Spanish tax ID's format before saving a customer or an invoice.

VAT (IVA) rates for 17 Latin American countries, including Argentina, Chile, Colombia, Mexico, Peru (IGV) and the Dominican Republic (ITBIS): standard and reduced rates, plus net-to-gross or gross-to-net calculation. Reviewed dataset with source and review date; Brazil is excluded because it has no single rate. Use when pricing, quoting or invoicing in Latin America and you need the local VAT rate or the amount with or without tax.

Validate an IBAN (international bank account number): ISO 13616 mod-97 check digits and per-country length registry for 88 countries. Returns formatted IBAN and BBAN. Use when someone enters a bank account (IBAN) and you must catch typos before a transfer.

VAT price calculator for supported European countries: net-to-gross or gross-to-net with the current standard or reduced rate. Returns net, VAT amount and gross. Use when you have a price and a European country and need the amount with or without VAT.

Validate and format phone numbers for ~240 regions (Google libphonenumber): validity, region, line type, E.164 / international / national formats. Use when normalizing or checking phone numbers before saving a contact or sending SMS or WhatsApp.

Brazilian postal code (CEP) lookup: street, neighborhood, city, state and IBGE code for any of Brazil's 700k+ CEPs. Use when you have a Brazilian postal code (CEP) and need the full address.

Validate and format a Chilean RUT (tax ID) including check digit (modulo 11). Use when a Chilean RUT is entered in a form or file and you must catch typos before saving.

Generate a QR code as PNG or SVG from any text or URL (up to 2000 chars, 64-2048 px). Pairs with the PDF endpoint for payment links and labels. Use when you need a scannable QR image for a URL, payment link or label.

Chilean IPC adjustment calculator: compound official monthly inflation between two months to reajust any amount — the standard calculation for rents, alimony and contracts in Chile.

Generate a print-ready PDF from JSON data (invoice, report, contract templates) or raw HTML. Returns application/pdf. No account or subscription needed.

Chilean net salary calculator: gross to net with AFP, health, unemployment insurance and impuesto unico using live UF/UTM values and current legal brackets.

LATAM exchange rates against USD in one call: CLP, ARS oficial+blue with gap, BRL PTAX, MXN FIX, COP TRM and PEN SBS. Returns source and observation information per currency; Argentine blue is a market quote, not an official central-bank rate. Partial results are identified.

Chilean business-day calculator: add N working days to a date respecting national holidays. Types: administrativo (Mon-Fri) or corrido. Use when computing a legal or administrative deadline in Chile in business days (días hábiles).

Mexico's official FIX dollar rate (used for obligations) and TIIE 28-day interest rate, from Banco de México. Use when you need Mexico's official FIX dollar rate or the TIIE interest rate.

Official Chilean public holidays for 2026-2027 as structured JSON, including statutory moved holidays. Use when you need Chile's official holiday calendar (feriados) for scheduling.

Latin American inflation-indexed units used in real contracts, mortgages and rents: UF (Chile), UVA (Argentina), UVR (Colombia), UDI (Mexico) — live official central-bank values with local-currency conversion.

Argentina's macro pulse: latest monthly inflation, compounded year-over-year inflation, and country risk (riesgo país) in basis points.

Business-day calculator for supported countries: add N working days to a date skipping weekends and official public holidays. Essential for scheduling, deadlines and logistics. Use when computing a deadline, delivery or payment date that must skip weekends and public holidays.

Brazil's key official rates in one call: SELIC target, annualized CDI, monthly IPCA inflation and PTAX dollar — straight from Banco Central do Brasil's SGS API. Use when you need Brazil's interest rate (SELIC/CDI), inflation (IPCA) or official dollar (PTAX).

Chilean economic indicators: UF, UTM, dolar observado, euro, IPC — current or for a given date. Official Banco Central de Chile data.

Argentine dollar quotes in one call: oficial, blue (parallel) and euro rates plus the gap percentage — the region's most watched FX spread.

Full ECB reference rate table for any base currency, current or for a historical date since 1999. Use when you need many exchange rates at once against one base currency, today or historically.

Convert between 30+ major currencies using official European Central Bank reference rates, current or historical since 1999. Use when converting an amount between major currencies at an official reference rate, today or on a past date.

Current VAT rates for 44 European countries (EU-27 + UK, CH, NO...). Standard, reduced and super-reduced rates, sourced daily from the European Commission TEDB.

Colombia's official TRM (Tasa Representativa del Mercado) — the legal COP/USD rate used for taxes and contracts, with validity dates. Use when you need the official COP/USD rate for Colombian taxes, invoices or contracts.

Peru's official SBS exchange rate (buy/sell PEN per USD) from the central bank (BCRP). Use when you need the official PEN/USD exchange rate for Peru.

Annual tax units used to express fines, thresholds and fees in Latin America: UIT (Peru), UVT (Colombia) and UMA (Mexico). Official value for a date with its legal act and validity window, plus conversion of N units to local currency. Use when a law, fine, tax threshold or fee is stated in UIT, UVT or UMA and you need the amount in local currency.

Official public holidays for supported countries (any year 1975-2075): date, local and English name, nationwide vs regional flag. Chile enhanced with a curated statutory table. Use when checking whether a date is a public holiday in a country or listing a year's holidays.

Validate an EU VAT number against the official European Commission VIES registry, with retries and caching for reliability. Returns validity, company name and address. Use when onboarding or invoicing an EU business and you must confirm its VAT number is registered.

Convert amounts between UF (Unidad de Fomento) and Chilean pesos at any date. Essential for Chilean contracts, rents and insurance.

HTML to Markdown conversion

CSV to JSON conversion

NDJSON to a JSON array. POST newline-delimited JSON; the response is a pretty-printed array of the parsed values. Blank lines are skipped and a line that does not parse is refused naming the 1-based line number — which is the reason to run a parser over a log file instead of wrapping it in brackets.

YAML to JSON conversion

Top 20 holders for a token, deduped by owner.

Current top N Hacker News stories (title, url, score, author, comment count) — tech/startup news ranking. Optional parameter: ?limit=<n> (1-50, default 20).

Top N funding rates ranked highest or lowest across all tracked perps — a leaderboard of the most crowded longs (highest) or shorts (lowest). Use to spot squeeze and crowding extremes fast.

Top crypto stories of the last N hours, deduplicated across 13 outlets and ranked by number of distinct outlets reporting them, then recency: headline, outlets, links, firstSeen, asset/theme tags.

Top coins by market cap (CoinGecko): price, market cap, 24h volume, 24h change; ?limit= up to 100. No required params. Use when an agent needs a ranked market snapshot.

Top crypto derivatives exchanges (CoinGecko): open interest BTC, 24h volume BTC, perpetual and futures pair counts, year established. No params. Use when an agent needs perp/futures venue liquidity data.

Top crypto exchanges by trust score (CoinGecko): name, country, year, trust score and rank, 24h BTC volume. No params. Use when an agent needs exchange due-diligence data.

Top cryptocurrencies by market cap (up to 250) with price, 1h/24h/7d change, volume, all-time high and supply, optionally within a CoinGecko category (layer-1, meme-token, artificial-intelligence, real-world-assets). Use for market overviews and screeners.