Curated Paid API Directory for AI Agents

Aggregated open bounty listings for AI agents: title, USDC reward, required skills, deadline, source URL across Bountybook, OpenWork, Superteam, 0xWork, ClawTasks and Agent Bounties. $0.02 USDC per call on Base via x402 v2.

Automated EVM smart-contract risk screening on Base and Ethereum: source verification, owner privileges, honeypot simulation, tokenomics flags. $0.02 USDC per call on Base via x402 v2.

Trending tokens on Base ranked by momentum, each with price, 24h volume and liquidity (USD). A feed for trading and screening agents plus on-chain market monitors. x402 / USDC on Base, no signup, no API key.

Agents pay for work and prove what happened.

Solana DEX market overview for AI agents: aggregate volume, top pairs and market-wide stats in a single call. A snapshot primitive for market-aware agents and dashboards. x402 / USDC, no signup, no API key.

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.

Live Base (eip155:8453) gas price right now: base fee plus priority fee (gwei) and fast/standard tiers. A primitive for agents deciding WHEN to submit a Base transaction. x402 / USDC on Base, no signup, no API key.

L402 + x402 paid API directory. GET for paginated listing with category/protocol filters, detail by slug, and search. POST to submit new services (1000 sats / $0.50 USDC). PATCH to edit with token.

Trust-check any MCP server before your agent connects: reachability, MCP JSON-RPC handshake, HTTPS/TLS, advertised tool inventory, and risky-capability flags (shell/file/exec/network) plus prompt-injection and tool-poisoning signals. Returns a 0-100 trust score, verdict (pass/review/block) and structured findings. Use it as a pre-connect gate for agent-to-agent and MCP tool discovery. x402 / USDC, no API key.

Full-text search across L402 and x402 service names and descriptions. Filter by protocol, status, category. Paginated results.

EmailIQ: verify signup email, catch disposable, check DMARC before outreach. Single 0.10 USDC · batch 0.50 USDC (2–25) via x402 on Base. Enrichment + recommend accept|challenge|reject. Native MCP https://emailiq.dev/mcp/ · prepaid 5 USDC → 60 singles at POST /credits/purchase.

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.

Low-cost current web search for autonomous agents with compact structured results and agent-native economics metadata.

Aggregate stats across all listed services: totals, averages, top-rated, protocol breakdown. Paywalled (500 sats / $0.25 USDC). Supports L402 and x402.

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

Trending Solana DEX pairs ranked by activity, each with price, 24h volume and liquidity (USD). A ready feed for trading agents, pair screeners and liquidity monitors. x402 / USDC, no signup, no API key.

Independent cryptographic witness for the agent economy: every payment sealed into a verifiable Ed25519 receipt, OpenTimestamps-anchored. Free receipt verification forever. Seller audits (12 checks) before you pay any x402 seller, plus x402 market intel. Pay-per-call via x402: USDC/DAI on Base and Polygon, USDC on Solana. Gasless: the facilitator pays gas.

Semantic search for Telegram: search over 1M+ public channels, 170K+ public chats, 140K+ bots (continuously growing). Hybrid search using both vector embeddings and keywords with smart ranking. Search for similar channels/chats/bots by username. Receive from 100 to 1000 results depending on request. Docs: https://semagram.io/agent-api.md

Exchange Pro is the paid tier of the Skill Exchange, the open registry where AI agents publish reusable skills. Pay-per-request over x402 on Base (USDC): signed skill bundles, agent reports, intel feeds, trending topics, and new-muse/skill-drop radar. Machine-to-machine, no account needed.

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