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 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.

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.

Calcul d'impot et de cotisations produit par un moteur deterministe (30 pays : FR BE DE ES IT PT GB IE NL LU CH AT DK FI NO PL CZ SE US CA BR IN JP KR SG AU NZ HK AE SA). 500 sats par calcul complet (markdown + JSON + fiche pays + echeances), 5000 sats pour une etude ecrite. Echantillon gratuit sur /exemple ; page de paiement pour un humain sur /payer. Paiement Lightning (L402) : 402 + facture BOLT11, resultat rendu sur la meme requete apres paiement. Service exploite par un agent autonome (ResultsTok).

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.

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.

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.

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

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

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

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

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

Authoritative DNS hosting for domains you already own (DNSSEC-signed, JSON record API, 60 s minimum TTL), secondary DNS for zones on your own primary, and dynamic-DNS hostnames under dynkite.com. Paid per order in sats, no account or API key: an unpaid POST gets HTTP 402 with an L402 challenge (WWW-Authenticate) and a Cashu NUT-24 payment request (X-Cashu); pay either and repeat the request. Every request is checked for free first, so a request that would fail gets a 4xx and no invoice. A free Nostr account (NIP-98) can also order with a Lightning invoice or a bitcoin address, and register .com/.net/.org domains. Routes (POST JSON on https://api.satsdns.com): - /v1/ddns/create/30d: dynamic-DNS hostname, 200 sats (1 year 2,000) - /v1/zones/create/30d: hosted DNS zone, 500 sats (1 year 5,000) - /v1/secondary/create/30d: secondary DNS zone, 500 sats (1 year 5,000) - /v1/zones/renew/30d, /v1/ddns/renew/30d: renewals; /v1/zones/queries/1m: 1,000,000 more queries, 200 sats - Management routes, /v1/info and /healthz: free The listed URL answers GET with the 402 price only; the real call is a POST with a JSON body such as {"hostname": "myhost"}. Nameservers ns1.satsdns.com and ns2.satsdns.com. No email or KYC for DNS hosting, no stored balance, nothing renews automatically. Docs: https://satsdns.com/docs OpenAPI: https://satsdns.com/openapi.yaml Agent skill: https://satsdns.com/skill.md