x402 Directory

Developer tools

Paid developer tools APIs an AI agent can call with x402.

272 endpoints

Hacker News Stories & Search · Hackernews

Hacker News Stories & Search · api.kadec0.xyz

Hacker News feed. Top, new, and best front-page stories plus full-text story search — titles, scores, comment counts, and author for tech and startup news.

$0.01 Base 100% up 49 paid calls

Tools API · DNS

Tools API · tools.bip-rep.com

Lightweight utility API for agents and operators: DNS lookups, RDAP/WHOIS domain data, HTTP probes, page metadata extraction, cryptographic hashing, JSON validation, scheduled webhooks, and exotic endpoints (Base transaction decode, ENS resolve, USGS earthquakes, cron next-run, TLS certificate report). No shell access; outbound URL tools enforce SSRF protections.

$0.05 Base 47 paid calls

Satellite Space API · Satellites

Satellite Space API · space.bip-rep.com

Dedicated satellite tracking API for agents: list CelesTrak TLE catalog groups (ISS, weather, and more), get live propagated positions for a whole catalog group, and predict the next pass over an observer latitude/longitude using NORAD catalog IDs. Outbound CelesTrak fetch only; no shell access.

$0.05 Base 43 paid calls

GitHub Repo & User Data · Github

GitHub Repo & User Data · api.kadec0.xyz

GitHub data. Repository stats, user profiles, and code-search results (stars, forks, language, topics, issues) via the GitHub REST API.

$0.02 Base 100% up 41 paid calls

X402 Coin Api · Price

X402 Coin Api · x402-coin-api.vercel.app

Coin fiyati API — anlik kripto fiyati (USD)

$0.001 Base 39 paid calls

Action402 · Execute Webhook

Action402 · action402.vercel.app

Paid webhook/API execution for autonomous agents. Executes one public HTTPS action after x402 payment, applies retries and idempotency, then returns a signed receipt with request hash, response hash, target, status, and attempt count.

$0.003 Base 35 paid calls

WebberSites x402 Data API · SEO Metadata

WebberSites x402 Data API · api.webbersites.com

Raw metadata extractor: the complete, unopinionated head inventory of a page — title, charset, lang, canonical, all meta tags grouped by family (OpenGraph, Twitter, Dublin Core, named, http-equiv, itemprop), every link relation, and JSON-LD returned as parsed objects. For agents doing their own processing (head-check audits the same data; this just dumps it). ?url=

$0.001 Base 100% up 33 paid calls

Minifetch Technical SEO API · RUN SEO Page Audit

Minifetch Technical SEO API · minifetch.com

Runs a full technical SEO audit on a single web page. Verify redirects, headers, meta tags, indexability, JSON-LD, missing or conflicting canonicals and more. No black-box scoring; just deterministic, composable signal you can act on. Every threshold is documented at https://minifetch.com/skills/seo-page-audit/SKILL.md

$0.01 Base 100% up 26 paid calls

Coil Crypto Gate · Crypto Gate

Coil Crypto Gate · coil.trade

START HERE — the cheapest answer we sell ($0.001) and the first call most agents make. Is crypto risk-on right now? Whether the BTC 200-day master gate is open or closed, the LONG/CASH state of the BTC and ETH sleeves, and a one-line verdict, all evaluated on UTC daily closes by a long-only rules engine. Poll it every cycle; when the gate flips, step up to /api/board/regime for the equity tape and /api/board/indices for the index ladder ($0.005 each). Research, not advice.

$0.001 Base 100% up 25 paid calls

Gateway · Notify SMS

Gateway · gateway.spraay.app

Send SMS notification for payment alerts.

$0.02 Base 100% up 25 paid calls

Soundside · MCP

Soundside · mcp.soundside.ai

create_text — $0.07 USDC

$0.07 Base 22 paid calls

Tag Per Track · Analyze With Lyrics

Tag Per Track · api.tag-per-track.cloud

Tag-per-Track: Agentic-First Musical Audio Analysis API. Extracts BPM, Key, Mood, Genres, Instruments AND Lyrics from audio URLs.

$0.10 Base 20 paid calls

Census record for one MCP server · MCP Server

Census record for one MCP server · aeml-x402.zeabur.app

[SIGNAL+PROOF] Census record for one MCP server (?name=): status, missing_streak, lifecycle, record_hash. DEGRADED DELIVERY, see unavailable_fields - prominence, maturity, github_stars, downloads and source_code_url have no data because the original collector stopped. Snapshot 2026-07-08. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.

$0.01 Base 20 paid calls

TickersFeed · Crypto Market

TickersFeed · api.tickersfeed.net

Global cryptocurrency market statistics — total market cap, 24h volume, Bitcoin dominance, and active coin count as JSON. Use for: crypto market overview, total market cap check, dominance analysis, risk-on/risk-off assessment. $0.001 USDC per call.

$0.001 Base 100% up 20 paid calls

StableTube · Download

StableTube · stabletube.dev

Create a paid StableTube download job. StableTube downloads the video server-side, uploads the mp4 to S3, and returns a temporary StableTube-owned download URL when ready.

$0.10 Base 20 paid calls

Vaaya · Modal Sandbox Exec

Vaaya · vaaya.ai

Modal — Run a command in a running sandbox and return its output.

$0.01 Base 100% up 20 paid calls

Truth Bear · Gauge Lifecycle

Truth Bear · api.truthbear.co

One id in, its official lifecycle state out - no need to know which line tracks it first. Covers 19 lifecycle lines (stablecoins, AI tools and datasets, neoclouds, DePIN, RWA, carbon projects, ESG funds, tariff measures and more): status band, birth/end dates, death type, lifespan, official source_ref. If two lines track the same id you get BOTH - nothing is picked for you. Unknown id -> 422 no_charge, not billed. Every record carries an offline-recomputable record_hash. $0.0050 per call.

$0.005 Base 100% up 19 paid calls

Full MCP ecosystem census · MCP Census

Full MCP ecosystem census · aeml-x402.zeabur.app

[BATCH+PROOF] Full MCP ecosystem census (21,236 servers, latest day): status, lifecycle, missing_streak, record_hash. DEGRADED DELIVERY, see unavailable_fields - prominence, maturity, github_stars and downloads have no data, so rows are no longer ranked. Snapshot 2026-07-08. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.

$0.09 Base 18 paid calls

BAGS Agent API

BAGS Agent API · www.getbags.app

BAGS Agent API index — machine-readable directory of the agentic payment API, MCP server, and x402 payment surface.

$0.01 Base 18 paid calls

mcp/graveyard · MCP Graveyard

mcp/graveyard · aeml-x402.zeabur.app

[BATCH+PROOF] MCP server graveyard - servers that vanished from the census. THRESHOLD stated plainly: listed on FIRST confirmed absence (confirm_absences=1), not multi-day confirmation; only two snapshot days exist. record_hash is null on these rows (imported from a surviving registry, the original collector never produced hashes). Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.

$0.09 Base 18 paid calls

Truth Bear · MCP Server

Truth Bear · api.truthbear.co

[SIGNAL+PROOF] Census record for one MCP server (?name=): status, missing_streak, lifecycle, record_hash. DEGRADED DELIVERY, see unavailable_fields - prominence, maturity, github_stars, downloads and source_code_url have no data because the original collector stopped. Snapshot 2026-07-08. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed. $0.01 per call.

$0.01 Base 100% up 18 paid calls

gauge/lifecycle · Gauge Lifecycle

gauge/lifecycle · aeml-x402.zeabur.app

One id in, its official lifecycle state out - no need to know which line tracks it first. Covers 19 lifecycle lines (stablecoins, AI tools and datasets, neoclouds, DePIN, RWA, carbon projects, ESG funds, tariff measures and more): status band, birth/end dates, death type, lifespan, official source_ref. If two lines track the same id you get BOTH - nothing is picked for you. Unknown id -> 422 no_charge, not billed. Every record carries an offline-recomputable record_hash.

$0.005 Base 17 paid calls

Obagents · Protected Igen

Obagents · obagents.vercel.app

x402 OB Image Generator · Price $0.01 per generated image https://obagents.vercel.app/api/obigen/protected/igen GET Query Params // The primary text description of the image to generate. prompt: string; Example: https://obagents.vercel.app/api/obigen/protected/igen?prompt=yourprompt · x402 OB Image Generator · Price $0.01 per generated image

$0.01 Base 16 paid calls