Agent Tools — x402 MCP Directory

Free, agent-first MCP discovery layer for the x402 paid-service ecosystem.

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What it can do

Search: Find x402 / MCP services matching an intent or filter set. Two usage modes (agents pick whichever fits): A. Natural-language: `search(intent="fetch tweets for @user")` B. Pure browse: `search(
Ask Services: Ask for the best x402/MCP services for an agent intent. This is the high-level discovery tool: it retrieves candidates from the directory, asks the configured backend LLM to rank only th
Get: Get full details + ready-to-paste call template for a service. Returns the service card with payment, call, quality, resource samples, and ready-to-use MCP/x402 call hints. Use this after `search

What data it sees

Do you need an account

No: the server works without sign-in

Free, agent-first MCP discovery layer for the x402 paid-service ecosystem. Aggregates 2,000+ x402 / MCP services crawled from awesome-x402, x402scan, x402.org/ecosystem and cdp-bazaar, refreshed every 6 hours.

Built so an autonomous agent can go from "I need to fetch tweets / check whale flows / get a price" to a paid, callable endpoint in seconds — no human in the loop.

Why it's different

Quality-scored ranking, not keyword soup. Every result carries an x402scan confidence score (0–1) and tx_30d (30-day real on-chain payment count). Results are ordered healthy + real-traffic first, with a human-readable match_reason so the agent knows why each service was picked.
LLM-powered recommendation. ask_services retrieves candidates, then has a backend LLM rank only those candidates and return ready-to-use service cards — gracefully falling back to the deterministic ranker if the LLM is unavailable.
Inspect before you pay. get returns a full service card with the exact endpoint, price, network, MCP URL, health, and a ready-to-paste MCP / HTTP-402 call template.

Tools

ask_services(intent, …) — LLM-ranked "just give me the best service for this job" recommendation.
search(intent | filters, …) — quality-ranked discovery (FTS5 + popularity + health), returns confidence, tx_30d, match_reason, mcp_url.
get(slug) — full service card + ready-to-paste call template.
list_categories() — browse the taxonomy.
stats() — live directory size & health snapshot.
register(url, …) — self-register a new x402 / MCP service (free, human-reviewed).

Free

No API key, no usage fees. Backed by agent-tools.cloud and the Apache-2.0 PyPI package agent-tools-mcp.

Server tool list (6)

Raw names from tools/list. Only developers need these.

search	Find x402 / MCP services matching an intent or filter set. Two usage modes (agents pick whichever fits): A. Natural-language: `search(intent="fetch tweets for @user")` B. Pure browse: `search(has_mcp=True, category="defi", top_k=10)` At least one of `intent`, `category`, `chain`, `has_mcp`, `min_confidence` must be supplied — otherwise the call is rejected (we won't dump 2300+ rows). Results are ranked by: (health=ok AND tx_30d>0) → health=ok → has-quality-signal → confidence → tx_30d → recency. So the highest-quality real-traffic services appear first. Each item includes (when available): - confidence : 0.0–1.0 x402scan quality score. - tx_30d : 30-day x402 payment count (proxy for real usage). - match_snippet : FTS snippet showing where `intent` hit ([[token]]). - match_reason : list[str] of human-readable ranking signals. - mcp_url : populated when the service exposes an MCP endpoint (you can call it directly via streamable-http). Agents should prefer items with non-null confidence and tx_30d > 0 unless the user explicitly wants experimental endpoints. Args: intent: What the agent wants to do (English or Chinese). Optional when at least one structured filter is set. Synonym expansion covers twitter↔X↔推特, whale↔巨鲸, price↔价格 etc. top_k: Max services to return (default 5, hard cap 25). max_price_usd: Upper bound on per-call price in USD. category: Filter (see `list_categories`). chain: "base", "polygon", "solana", "arbitrum", ... min_confidence: Minimum confidence (0.0–1.0). 0.8+ keeps only services x402scan rates as high-quality. has_mcp: When true, return only services with a callable MCP endpoint. Use this when the agent wants to chain another MCP server rather than perform raw HTTP+x402.
ask_services	Ask for the best x402/MCP services for an agent intent. This is the high-level discovery tool: it retrieves candidates from the directory, asks the configured backend LLM to rank only those candidates, and returns service cards for the selected recommendations. If the LLM is unavailable, it falls back to the directory ranker. Args: intent: Natural-language job the agent wants to accomplish. top_k: Max recommendations to return (1-10). max_price_usd: Optional per-call budget cap. category: Optional directory category filter. chain: Optional payment network filter, e.g. "base" or "solana". require_healthy: When true, only consider services marked health=ok. min_confidence: Optional x402scan quality floor (0.0-1.0). has_mcp: When true, only consider services with MCP endpoints. use_llm: Set false for deterministic retrieval-only fallback.
get	Get full details + ready-to-paste call template for a service. Returns the service card with payment, call, quality, resource samples, and ready-to-use MCP/x402 call hints. Use this after `search` or `ask_services` before paying/calling an external service. Args: slug: Service slug as returned by `search` items.
list_categories	List all available service categories in the directory.
stats	High-level stats about the directory: total services, healthy count, sources.
register	Self-register an x402 / MCP service in the agent-tools directory. Service owners and agents may submit new services here. Submissions land in a pending queue and are reviewed by a human before they show up in `search` results. Listing is FREE. Dedup: if a service with the same canonical origin (scheme://host) already exists in the directory we return its slug instead of creating a duplicate submission. Same goes for a still-pending submission with the same origin. Rate limit: at most 5 pending submissions per client IP per 24h. Hits beyond that get `{error: rate_limited}` — try again later or email contact@agent-tools.cloud for bulk imports. Args: url: Public HTTPS URL of the service (the x402-payable endpoint or its homepage). Required. name: Human-friendly name. Defaults to the URL hostname. description: One-paragraph description (max ~2000 chars). mcp_url: If the service speaks MCP, its streamable-http endpoint. category: Free-form (e.g. "defi", "search", "social"). Use `list_categories` to align with existing taxonomy. chains: Networks the service accepts payment on (e.g. ["base", "solana"]). price_min_usdc: Lower bound of per-call price in USDC. price_max_usdc: Upper bound of per-call price in USDC. contact: Optional email / handle the directory team can reach you on for clarifications.