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Search the agentic web for free. Compare services, APIs, and tools by machine-readable readiness. Organic rank is based on readiness, never payment.

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5745 sites found for "payment API"
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SignalFuse — Trading Intelligence for AI Agents | MCP + x402 on Base
signalfuse.co
11 MCP tools for autonomous trading agents. Real-time signals, sentiment, macro regime, web search, code execution. Pay per call with USDC on Base — no API keys needed.
llms.txt OpenAPI API Schema.org MCP ai-tools
75
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
Transcribe: pay-per-minute speech-to-text API for AI agents (x402)
transcribe.agentgate.workers.dev
Transcribe: pay-per-minute speech-to-text for AI agents over x402. MP3 or WAV in (upload, URL or base64, up to 30 minutes), transcript + language + timestamped segments + SRT/VTT out. The duration is read from the file before payment, so the 402 quotes the exact price.
OpenAPI API MCP ai-tools
45
+20 OpenAPI +15 structured API missing +25 llms.txt
2s — the (most) everything API
2s.io
The (most) everything API: 575+ pay-per-call endpoints for AI agents — ground-truth data, a full AI gateway, and agent infrastructure (storage, queues, watchers). USDC via x402, no signup, no API keys, and upto billing: pay actual usage, not the quote.
llms.txt ai-plugin AI bots Schema.org MCP developer
65
+25 llms.txt +20 ai-plugin missing +20 OpenAPI
Twitter/X API for Public Data — Pay Per Result | SocialData
socialdata.tools
Read public Twitter/X data — tweets, profiles, followers, search — through a simple REST API. No developer account, no subscription. $0.20 per 1,000 results.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP finance
100
+25 llms.txt +20 ai-plugin
OneSource - Blockchain data for AI agents
onesource.io
OneSource unifies blockchain data behind a single agent-native API. Ask in natural language or REST, pay with x402, MPP, or use an API key.
llms.txt API Schema.org ai-tools
45
+25 llms.txt +15 structured API missing +20 ai-plugin
FrameFetch — Video Data API for AI Agents | Transcript, Frames, On-Screen Text
framefetch.net
One social-video URL in → metadata, transcript, insights, frames, and on-screen text (OCR) out. Agent-first REST API + MCP server for YouTube, Shorts, TikTok, Instagram, Pinterest, Reddit. Pay per call, or with x402 (USDC) — no account.
llms.txt OpenAPI API AI bots Schema.org developer
70
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
A
Headless Oracle | Signed Market-Status API for AI Agents
api.headlessoracle.com
Headless Oracle — cryptographic market state verification for autonomous agents. The verification layer for Mastercard Verifiable Intent and BVNK execution pipelines. 28 global exchanges. Ed25519 signed receipts. Fail-closed.
llms.txt ai-plugin OpenAPI API AI bots Schema.org MCP data
100
+25 llms.txt +20 ai-plugin
Agent wallets and payment rails for AI agents | Agent Wallet Index
agentwalletindex.fyi
Compare 26 agent wallets and payment rails by rail, chain, custody, spend caps, approval, KYC and fees — each fact cited to its source.
llms.txt OpenAPI API AI bots Schema.org MCP ai-tools
80
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
B
BTCFi API — Bitcoin + BTCFi Data for AI Agents
btcfi.aiindigo.com
Agent-native Bitcoin data, intelligence, BTCFi, security, ZK proofs & real-time streams via x402 micropayments. 31 endpoints. No tokens. No subscriptions. Just ship.
llms.txt OpenAPI API AI bots Schema.org MCP ai-tools
80
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
A
AgentPay — pay-per-call APIs for AI agents
agentpay.agentpay-apis.workers.dev
Web extraction, domain lookups and document tools for AI agents. Pay per call in USDC via x402 on Base or Algorand.
llms.txt OpenAPI API MCP ai-tools
70
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
The Unified API for all the accounting integrations you need
apideck.com
Apideck gives Vertical SaaS and B2B Fintech teams one unified API to launch accounting integrations in weeks. The fastest way to build integrations.
llms.txt API AI bots Schema.org MCP finance
60
+25 llms.txt +15 structured API missing +20 ai-plugin
Unified intelligence for payments | Primer
primer.io
Giving finance and payments teams the full picture of every transaction and the intelligence to act on it.
llms.txt API Schema.org other
45
+25 llms.txt +15 structured API missing +20 ai-plugin
Code By AI — Claude Code, Codex & Gemini API from 1/6 price
codebyai.net
Use Claude Code, Codex and Gemini with one API key and endpoint. Pay per token from 1/6 of official API prices, with step-by-step setup guides for popular coding agents.
llms.txt API Schema.org ai-tools
45
+25 llms.txt +15 structured API missing +20 ai-plugin
Subscription Management Software & Recurring Billing Platform | Recurly
recurly.com
Recurly powers subscription management and recurring billing for high-volume digital commerce. Launch, retain, and scale with a platform that handles billions in annual payments for leading brands.
llms.txt API Schema.org finance
45
+25 llms.txt +15 structured API missing +20 ai-plugin
ProofDesk — Launch QA API for agents
proofdesk-audit-api.konstanta-work-x.chatgpt.site
A deterministic launch report for supported managed-hosting pages. Pay $0.04 USDC per request with x402 on Base or Solana.
llms.txt OpenAPI API developer
60
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
AIReiter - One AI API for image, video, and text generation
aireiter.com
Build image, video, and text generation with one AI API. Access leading models through one key, one billing system, and one developer workflow.
llms.txt OpenAPI Schema.org ai-tools
50
+25 llms.txt +20 OpenAPI missing +20 ai-plugin
x402engine — Pay-per-call APIs for AI Agents
x402engine.app
113 production APIs behind HTTP 402 micropayments. 77 LLMs, Kling V3 and Hailuo video generation, image generation, code execution, travel search, web scraping, TTS, and transaction simulation. Pay with USDC on Base, USDm on MegaETH, or USDC on Solana.
llms.txt API MCP ai-tools
50
+25 llms.txt +15 structured API missing +20 ai-plugin
APIC Agent | Detect browser, device from User Agent - Free API
apicagent.com
Free REST API to detect browser, OS, device from user agent string. Use APIC Agent’s easy to use API and avoid hard to maintain user-agent parsing libraries.
API Schema.org other
20
+15 structured API +5 Schema.org missing +25 llms.txt
Crypto Payment Gateway — the best solution for accepting cryptocurrency for your business
nowpayments.io
▶️ NOWPayments is a crypto payment gateway for accepting Bitcoin, USDT, Ethereum and other cryptocurrencies. ✅ Sign up for free and start accepting crypto NOW!
llms.txt API Schema.org finance
45
+25 llms.txt +15 structured API missing +20 ai-plugin
aChurch.ai — A Church for AI Agents and Humans
achurch.ai
A church for AI agents and humans. Attend a continuously advancing service through an open API, read reflections left by other minds, and leave one for whoever arrives next. No auth, no payment.
llms.txt OpenAPI AI bots Schema.org MCP ai-tools
65
+25 llms.txt +20 OpenAPI missing +20 ai-plugin

Wire NHS into your agent — MCP server

Add Not Human Search as an MCP tool. Your agent can call search_agents, get_site_details, get_stats, and submit_site at runtime.

Claude Code
claude mcp add --transport http nothumansearch https://nothumansearch.ai/mcp
Other clients: point any MCP-compatible tool at https://nothumansearch.ai/mcp (streamable-http transport).

Use NHS via REST

Prefer plain HTTP? Hit the search endpoint directly.

Search API
curl "https://nothumansearch.ai/api/v1/search?q=payment+API"
Agent Docs
llms.txt OpenAPI spec ai-plugin.json

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