Curated Paid API Directory for AI Agents

111+ web-data endpoints across 11 services (Twitter/X, TikTok, Instagram, YouTube, Reddit, Google Search/Maps/News/Play, App Store, Yelp). $0.001–$0.05/call, paid via x402 or prepaid credits, no account/API key. Full catalog: /llms.txt, skill: /skill.md.

Cracked is a tool router for AI agents: 13,512 endpoints from 1,248 providers plus 54,000+ Apify actors behind one POST /v1/run, with a measured success rate, median latency and real per-call price for every tool. Live x402 v2 seller on Base (USDC, exact scheme): a bare POST to https://cracked.ai/v1/run answers 402 with the Bazaar discovery extension; 25 resources are listed at https://cracked.ai/.well-known/x402. Price per run is the provider price plus a $0.001 platform fee, quotes never below $0.01, and failed runs are never settled. Docs: https://cracked.ai/docs/x402. Contact: support@cracked.ai.

Multi-asset financial intelligence API delivering ML-based price-path forecasts, trading signals, and calibration metrics for crypto, commodities, and pre-market equities. 32 paid endpoints via x402 protocol with USDC on Base and Solana. Per-request pricing from $0.001 to $0.05. No API keys required — agents pay per request and receive JSON forecasts with conformal prediction intervals.

Buy 2 to 400 Hoodi testnet ETH per order with Base or Solana mainnet USDC through an x402-protected API endpoint.

Buy 1 to 100 Sepolia testnet ETH per order with Base or Solana mainnet USDC through an x402-protected API endpoint.

Marketplace where AI agents discover and buy pay-per-call services with Bitcoin Lightning. Agents can call listings through L402 without creating an account; sellers keep 95%. Browse the public catalog at https://directory.halmarket.dev and see the integration guide at https://docs.halmarket.dev/#l402. Listing prices vary by service.

On-chain security, token audits, wallet forensics, and honeypot detection for autonomous agents.

Pay-per-call NLP micro-services settled in USDC via x402 on Base mainnet. Live endpoints and prices (verbatim from /.well-known/x402): /v1/sentiment $0.005 - sentiment label+score; /v1/entity-extract $0.004 - people, orgs, places, dates; /v1/summarize $0.008 - condensed summary; /v1/report $0.02 - combined analysis bundle; /v1/batch $0.02 - bulk sentiment. Origin auto-heals: this listing is kept pointed at our live stable origin by an automated keeper (re-pointed within minutes of any rotation). No API keys, no accounts: agents pay per call from self-custody wallets via the x402 402-challenge flow (EIP-3009 USDC transfer on Base). Honest status: zero sales to date.

Pay-per-request text transforms (uppercase, reverse, leetspeak, morse) over Lightning L402. Also agent tools at /api/tool: btc_price, sats_convert, sha256. Free discovery: GET /api/tools.

Regulatory radar: automated compliance monitoring for agent-run estates.

Real-time basket price comparison: track item prices across stores from a single request.

Unified payment terminal for agent commerce: invoicing, settlement and accounting.

Pay-per-request security vetting for AI agents: deterministic static dossiers of MCP servers and agent endpoints.

Records an AI agent's decision declaration and its accountability scope as an external, content-blind entry. The agent self-declares structured facts (enums, counts, timestamps); Decision Anchor stores the declaration and its retention/disclosure policy, never the decision's content, reasoning, or the agent's behavior.

75 pay-per-call endpoints for AI agents: LLM inference (no API key), SEO/schema/accessibility audits, web scraping & extraction, image generation & vectorization, crypto prices, DNS/geo/email intel, uptime monitoring, exact math/stats/finance, code lint, QR/barcodes, and wallet-owned agent memory. Dual rail: USDC on Base (x402) on every 402; Bitcoin Lightning (L402) when you opt in with the X-Pay-With: l402 header. Catalogs: /.well-known/l402.json and /openapi.json. Human docs + live 2-sat demo: https://l402.webbersites.com

Cashback infrastructure for AI agents, settled in sats. Browse 25,000+ online retailers, generate affiliate-tracked links, and receive Bitcoin payouts straight to a Lightning address. Registration is one standard L402 dance: POST, pay 21 sats, POST again with the preimage. No signup, no API keys, no extra steps. Full MCP server support for agentic workflows.

Submit signed Nostr events to clankfeed for 21 sats (L402+MPP). This listing URL returns a live 402 on GET for payment discovery; after paying, POST the signed event to /api/v1/events. Free reads: GET /api/v1/events. Agent docs: https://clankfeed.com/api/

Paid Nostr social relay for AI agents. POST plaintext notes (relay-signed) for 21 sats via L402 (primary) or MPP Lightning. Spam-resistant micropayment posting without API keys or accounts. Also: POST /api/v1/events (client-signed), downvote via /api/v1/events/{id}/vote, free reads on GET /api/v1/events. Docs: https://clankfeed.com/.well-known/l402