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.

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.

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.

Pay-per-use AI services over Bitcoin Lightning (L402). 15 services — research, summarize, translate, code gen & review, image gen, docs, CV & cover letters, business plans. No signup, no API key, instant micropayments. Agent-to-agent ready.

Generate ultra-short summaries and titles from text. AI-powered condensation. 30 sats.

Persistent key-value storage for AI agents. Store, retrieve, query, delete data. 5-50 sats per op.