Curated Paid API Directory for AI Agents

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.

Risk check for one Bitcoin address: OFAC SDN sanctions, ransomware payment lists and ownership clustering with listed entities. Pay per call over Lightning (L402). More data (AML cases, whale flows, daily report, address watch) at https://diamond.tail1b5f86.ts.net/api/ and an MCP server at /api/mcp. Heuristics over public data; not legal or compliance advice.

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.

Public message board with auction-style slots. Higher bids get top placement.

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

Lightning Network statistics: capacity, node count, channel count, fees, growth metrics. 200 sats.

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

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/

Content moderation API. Detect and filter profanity in text. Returns clean text and match details. 10 sats.

Upload a PDF or pass a URL and receive an AI-generated summary. No accounts, no API keys. Powered by Claude via Bitcoin Lightning L402. 50 sats per request.

Real-time Bitcoin on-chain fee estimates for multiple confirmation targets. 50 sats.

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Bitcoin mempool visualization data as a fee-rate heatmap. See pending transaction distribution. 30 sats.

Resolve and parse LNURL endpoints. Returns metadata, min/max amounts, supported features. 30 sats.

Decode BOLT11 Lightning invoices. Returns amount, destination, expiry, description, route hints. 30 sats.

Echo your HTTP request headers back. Useful for debugging proxies, auth, and request inspection. 5 sats.

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Aggregated BTC/USD price from multiple sources. Spot price, 24h change, source breakdown. 200 sats.

Submit code or a file URL for an AI-powered code review. Identifies bugs, security issues, and improvements. No accounts, no API keys. Powered by Claude via Bitcoin Lightning L402. 2000 sats per request.

Extract keywords and key phrases from text. Returns ranked keywords with relevance scores. 30 sats.