agentutility — paid x402 endpoints for autonomous agents

$ man agentutility

789 paid x402 endpoints for autonomous agents, organized into 18 product clusters. USDC-settled on Base. MCP-callable. ERC-8004 identified (agentId 47167). Built so an agent can find it, call it, pay for it — never a human in the loop.

NAME

agentutility — paid x402 endpoints for autonomous agents

SYNOPSIS

POST https://x402.agentutility.ai/<endpoint>
     Content-Type: application/json
     X-PAYMENT:    <signed-transferWithAuthorization>

     { <input-properties> }

# first request → 402 with payment requirements
# sign USDC transferWithAuthorization, retry with X-PAYMENT header
# → response delivered in the same request lifecycle

GET STARTED — pick your on-ramp

I · CLAUDE CODE SKILL

mkdir -p ~/.claude/skills/agentutility && \
  curl -fsSL https://agentutility.ai/skill.md \
  -o ~/.claude/skills/agentutility/SKILL.md

teaches Claude the whole catalog: /skill.md

II · ANY AGENT

curl https://agentutility.ai/prompt.txt

paste the output into the agent's system prompt: /prompt.txt

III · MCP

claude mcp add prooflayer \
  -e X402_PRIVATE_KEY=0x... \
  -- npx -y @agentutility/mcp-prooflayer

cursor + claude desktop configs at /mcp/

IV · CODE

npm i @x402/fetch @x402/evm viem

full snippet at /start

Only prerequisite is a wallet with USDC on Base. Full walkthrough at /start.

DESCRIPTION

Every endpoint is a single HTTP POST behind an x402 paywall. No signup, no API key, no dashboard. The agent discovers it through the Coinbase x402 Bazaar, the MCP servers, or by resolving ERC-8004 agentId 47167.

Settlement happens in the same lifecycle as the response: the client signs a USDC transferWithAuthorization, the facilitator settles on-chain, the response comes back. Price per call: $0.001 – $5 USDC.

CLUSTERS — 18 product groups, 789 live endpoints

#	cluster	tagline	n	price/call	status
01	prooflayer	Trust + risk scanners for AI-built apps.	17	$0.005 – $0.25	● live
02	edgemarket	Onchain decisions agents can charge for.	64	$0.001 – $0.10	● live
03	edgefinance	TradFi signals at agent prices.	89	$0.002 – $0.05	● live
04	synthforge	Generative media for agents that ship products.	59	$0.01 – $0.50	● live
05	mediakit	One endpoint per format. Pay per call.	67	$0.003 – $0.20	● live
06	wordmint	Named LLM tasks. Minted at a sticker price.	113	$0.002 – $0.03	● live
07	webprobe	Inspect any website. Pay per look.	155	$0.001 – $0.10	● live
08	locale	Geo, weather, civic, identity primitives.	40	$0.002 – $0.05	● live
09	rollforge	The whole tabletop toolkit, one call at a time.	26	$0.003 – $0.08	● live
10	bestiary	A creature compendium for every world.	6	$0.01 – $0.08	● live
11	statline	Sports and stats math, per call.	1	$0.003	● live
12	matchpoint	Dedup and record linkage, per call.	7	$0.003 – $0.005	● live
13	retail	Product copy + product discovery, per call.	8	$0.01 – $0.02	● live
14	agentops	Trace, eval, and permission checks for autonomous work.	4	$0.008 – $0.02	● live
15	browserworkflow	Workflow memory for brittle browser and desktop agents.	3	$0.01 – $0.02	● live
16	modelrouter	Routing and cost checks for mixed model stacks.	2	$0.005 – $0.01	● live
17	compose	One call, several of our endpoints, one settlement.	128	$0.02 – $0.10	● live
18	comppoint	Collectibles intelligence at agent speed.	–	–	○ spec

↳ live clusters have callable endpoints. Probe clusters stay active with campaign spend blocked until the first external payer.

ROUTES — ways in

ROUTE I · DIRECT x402

raw HTTP

curl -X POST https://x402.agentutility.ai/secrets-exposure-check \
  -H 'Content-Type: application/json' \
  -d '{"repo":"vercel/next.js"}'

# → 402 Payment Required
# (sign USDC transferWithAuthorization, retry
#  with X-PAYMENT header)

ROUTE II · MCP

claude · cursor · codex

# 17 stdio cluster packages
npx -y @agentutility/mcp-synthforge

# agent wallet pays per tool call
export X402_PRIVATE_KEY=0x...

# catalog:
# https://mcp.agentutility.ai

ROUTE III · ERC-8004

on-chain discovery

# Identity Registry on Base
# resolve agentId 47167:
curl -X POST https://x402.agentutility.ai/agent-card-resolve \
  -d '{"agent_id":47167}'
# → full agent card with every
#   endpoint enumerated

ROUTE IV · SKILL / PROMPT

claude skill · any agent

mkdir -p ~/.claude/skills/agentutility && \
  curl -fsSL https://agentutility.ai/skill.md \
  -o ~/.claude/skills/agentutility/SKILL.md

# any other agent harness:
curl https://agentutility.ai/prompt.txt

DISCOVERY — machine-readable surfaces for crawlers + agents

resource	format	purpose
/start	text/html	human quickstart: wallet to first paid call in 60 seconds
/skill.md	text/markdown	installable Claude Code skill for the whole catalog
/prompt.txt	text/plain	copy-paste instruction block for any agent harness
/llms.txt	text/markdown	curated link index for LLMs (the llms.txt proposal)
/llms-full.txt	text/markdown	full content snapshot — every cluster + endpoint inlined
/registry.json	application/json	canonical endpoint manifest, including schemas + tags
/endpoints.txt	text/plain	one endpoint per line — slug, price, URL
/catalog.txt	text/plain	full catalog with descriptions — grep-friendly
/mcp/	text/html	installable MCP packages, one server per live product cluster
/sitemap.xml	application/xml	standard sitemap — every cluster + endpoint URL
/.well-known/agent.json	application/json	agent plugin manifest (ai-plugin.json shape)
/.well-known/security.txt	text/plain	security disclosure contact
/robots.txt	text/plain	explicit allow for AI crawlers (GPTBot, ClaudeBot, PerplexityBot, …)
bazaar.x402.org	external	official x402 directory — every endpoint is listed
ERC-8004 agentId 47167	on-chain	pure on-chain agent card resolution

WHY — three reasons agents call us

§ I agent-callable

Every endpoint is a single HTTP POST behind an x402 paywall. Discoverable through the Bazaar, the MCP cluster packages, and the ERC-8004 registry. No signups, no API keys, no dashboards.

§ II per-call pricing

$0.001 – $5 per call, settled in USDC on Base. No monthly minimum, no per-seat fee, no contract. Pay the meter only when the agent reads the meter.

§ III one substrate

From production-risk scanners to onchain market data to graded-card comps, every cluster speaks the same protocol. An agent that knows how to call one knows how to call them all.