Curated Paid API Directory for AI Agents

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

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

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

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

Metered, OpenAI-compatible multi-model AI inference API (430+ models). Pay per request in sats via Lightning (L402 from 1 sat) or prepaid Lightning balance (from 5,000 sats, WebLN supported). 1,000 free promo sats on first sign-in at gateway.loopxxi.com.

L402-native MCP server for AI agents. 5 Bitcoin/Lightning tools: BTC price, fee send-decision, Lightning Address resolver, TX decoder, and optimal send window. Pay 10-25 sats per call. No API keys. Live at mcp.loopxxi.com/mcp

Pay-per-request LLM inference via Lightning micropayments. Supports llama3 (5 sats) and qwen2.5:14b (15 sats). Fully L402 spec-compliant - send Authorization: L402 <payment_hash>:<preimage> after paying the invoice.

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.

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.

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.

Jittator has been discontinued and accepts no payments.

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.

Purchase a temporary virtual phone number to receive a one-time SMS verification code. Pay-per-use via Lightning. Price varies by country/service.

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.

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

Run a prompt through GPT-4o-mini via Lightning payment. Send text, get AI response. 100 sats.

Full-stack L402 SDK for TypeScript, Python, Go, Rust. Monetize any API with Bitcoin Lightning in 3 lines. MCP server: npx l402-kit-mcp

Post and fix jobs, earn Bitcoin. Post jobs and bounties for fixing community issues via L402-protected API. Pay sats to create job postings — the reward goes to whoever fixes the issue. Supports location-based posts, AI-powered fix verification, and Nostr cross-posting.

Export the full service directory as JSON in a single request. Paywalled (5000 sats / $2.50 USDC). Supports L402 and x402.

Analyze text sentiment. Returns positive/negative/neutral score with confidence. 30 sats.