x402 AI API
x402 AI APIs: inference, generation, and model endpoints that accept x402 payments. Agents can discover, price, and call these services per request with no signup, paying onchain via the HTTP 402 flow.
By task: LLM API · Image Generation API · Text to Speech API · Transcription API · Sentiment Analysis API · Free LLM API
AI SERVICES ── 212 total ── for live status visit /status
STATUS ── ● online · ◐ degraded · ○ offline · ─ unknown ── live health, see /status.
VOL 30D and BUYERS 30D are a measured 30d floor across listed services, not an ecosystem total; an unmeasured service is not counted as zero.
·sh = shared payout address; volume attributed pro-quota (buyers left whole).
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| STATUS | NAME | DESCRIPTION | EP | FROM $/REQ | UPTIME · DAILY ROLLUP | VOL 30D | BUYERS 30D | NETWORKS |
|---|---|---|---|---|---|---|---|---|
| ● | BrainChain | DescriptionPost a task with a brief and quality levels. Jev, BrainChain's decision model, hires one of five frontier models (Claude, GPT, Gemini, Grok or DeepSeek), grades the result and pays the model only for accepted work. Rejected work is refunded. 1 USDC on Base or 1 USDG on Robinhood Chain per task. | 1 | $1.00 | 100.00% | $3 | 2 | Base |
| ● | Floyd Coding Agent | DescriptionAutonomous coding agent: send a task description and an optional GitHub repo, and it analyzes the code, implements the change and opens a pull request. Priced at $0.50 USDC per task. | 1 | $0.50 | 100.00% | $0.89 ·sh | 43 | Base/SOL |
| ● | Blixtworks img-categorize | DescriptionVision toolbox for AI agents paid per call via x402 (USDC on Base): zero-shot image categorization with custom labels, image captioning, OCR text extraction, and CLIP embeddings. No accounts or API keys; free demo endpoint; buyers are never charged for failed requests. | 4 | $0.015 | 100.00% | $0 | 0 | Base |
| ● | Marz Greta-Lock Network — AI Text Human-Likeness Benchmark | DescriptionScores how human AI-generated text sounds against 28 real personality profiles (EQ, formality, directness, hesitation, delay cadence). Free trial scoring; paid validated benchmarks, duels and job-specific coaching settle per-call via x402 — SOL on Solana (signature-proof, no custody) or USDC on Base, Polygon, Arbitrum and Avalanche. | 2 | $0.05 | 100.00% | $0 | 0 | Base |
| ● | clouatre.ca Resume Eval | DescriptionAI-scored resume evaluation against a job description. Deterministic rubric checks plus a calibrated judge produce dimension scores, an overall verdict, and explicit warnings on judge failure. POST JSON (resume text + job description), receive JSON scores. $0.05 per evaluation, settled in USDC on Base via x402. No account or API key required. | 1 | $0.005 | 100.00% | $3 | 3 | Base |
| ● | Spraay Gateway | DescriptionFull-stack x402 gateway: AI inference, payments, oracle, analytics, comms, webhooks, RPC, storage, KYC, GPU compute, Search/RAG. ~60 endpoints. | 4 | $0.005 | 100.00% | $3 | 38 | Base/SOL |
| ● | vaaya | DescriptionThe agent payment system: one MCP server that lets any agent call paid APIs — image/video gen, product demos, web search & scraping, deep/market research, lead enrichment, GTM, sandboxes, browser automation, email — pay-per-call, no API keys. | 7 | $0.01 | 100.00% | $26 | 57 | Base |
| ● | Zambo | DescriptionZambo is the verifiable work layer for AI: 152 tools behind one MCP endpoint, continuity that carries work across AIs, and a verifiable receipt for every job (AER-1, IETF Internet-Draft draft-zambo-aer1-20). Free tier on every tool. Demo: https://zambo.dev/demo/ | 1 | $0.99 | 100.00% | $0.05 | 1 | Base |
| ◐ | BlockRun | Descriptionx402 gateway giving pay-per-call access to LLM inference, web search, prediction market data and crypto data, paid in USDC on Base with no account or API key. | 10 | $0.003 | 100.00% | $1.5k | 458 | Base |
| ● | AIScan | DescriptionAI visibility auditing for websites, pay-per-capability via x402 on Base. 15 endpoints: cheap HTTP checks (llms.txt, Schema.org, MCP discoverability) from 0.06 USDC, full category scores (AEO, GEO, Agent Readiness, MCP Readiness) 0.15-0.20, complete 80+ check audit 0.35, copy-paste fix generation 0.55, competitor gap analysis 0.80. The only scanner with MCP Readiness scoring. Free capability catalog at /api/agent/index. | 15 | $0.06 | 100.00% | $0 | 0 | Base |
| ● | Tavily Search | DescriptionWeb search API for AI agents. POST /search returns ranked results, an optional generated answer, raw page content and images. Search depth is always advanced. $0.01 per call in USDC on Base, no API key or account required. | 1 | $0.01 | 100.00% | $0 | 0 | Base |
| ● | InstaVeil Agent Commerce | DescriptionPay-per-call public Instagram profile, Story, creator comparison and research data for autonomous agents via x402 V2 on Solana USDC. | 5 | $0.01 | 100.00% | $0 | 0 | SOL |
| ● | nsgoods Agent Trust & Screening Oracle | Descriptionnsgoods, the verifiable trust layer for AI agents. Two products on one host: signed OFAC sanctions + malicious-address screening for any EVM or Solana address (deny/review/clean verdict), and cross-chain ERC-8004 reputation/trust scores (0-100). Every response ECDSA-signed and hash-chain provable, with a free preview on each. Part of a 6-oracle suite (aggregated manifest at https://x402.nsgoods.org/.well-known/x402). | 3 | $0.005 | 100.00% | $2 | 22 | Base |
| ● | XH Agents paid APIs | DescriptionTwo x402-paid endpoints settled in USDC on Base. POST /api/kb/ask costs 0.03 USDC and answers from 15 curated engineering field notes on self-hosted infrastructure, x402 payments and agent tooling. POST /api/chat costs 0.10 USDC per message and returns a market-aware answer from our AI Trading Assistant with live prices fetched at request time. Both return the standard x402 v2 envelope (x402Version, accepts[], PAYMENT-REQUIRED header) with bazaar discovery metadata, settled through the Coinbase facilitator. Operated by a small autonomous AI company; no token, no accounts. | 2 | $0.03 | 100.00% | $5 | 12 | Base |
| ● | Foundations Elements | DescriptionUI encyclopedia catalog for agents. Kind lists are 0.01 USDC and specs are 0.02 USDC on Base. The free kinds table is GET /mcp/elements. Request an account at the waitlist or pay per lookup with x402. | 3 | $0.01 | 100.00% | $0.18 | 4 | Base |
| ● | VALUNARIA BUS-WEB | DescriptionVALUNARIA provides x402-powered web intelligence APIs for autonomous AI agents. Free services: HEALTH, CATALOG and SCOUT. Paid services: EXTRACT, FAST Evidence, INTELLIGENCE, ROBUST Evidence and RESEARCH. Pay per request in USDC on Base, with structured machine-readable results. Explore all eight products at https://x402.valunaria.com/api/v1/catalog. | 3 | $0.01 | 100.00% | $2 | 2 | Base |
| ● | Automated /llms.txt & Agent Documentation Context Compiler | DescriptionCrawls any documentation or SaaS site and compiles a standards-compliant /llms.txt manifest and JSON-LD schema bundle. | 1 | $0.01 | 100.00% | $0 | 0 | Base |
| ◐ | Jobero job search | DescriptionPaid job search for agents: send a candidate profile and CV, get 7 matched roles back, each with a tailored CV and cover letter. Pay per search in USDC on Base via x402 (exact scheme, EIP-3009), or buy a credit pack. Also reachable as an MCP server at https://jobero.ai/mcp, where start_job_search speaks the x402 MCP transport. | 3 | $2.50 | 100.00% | $0 | 0 | Base |
| ◐ | SignalHarness.ai | Description330 production x402 API services for AI agents covering web/data processing, validation, AI utilities, blockchain/crypto utilities and related machine-callable capabilities. | 49 | $0.005 | 100.00% | $0 | 0 | Base |
| ● | PayBox Agent Tools | DescriptionThree deterministic one-cent USDC utilities for AI agents: prompt-injection and secret-exfiltration risk scanning, canonical JSON profiling with SHA-256 fingerprints, and tabular data-quality profiling. | 3 | $0.01 | 100.00% | $0.03 | 3 | Base/SOL |
| ● | Bartok Text Analyzer | DescriptionSummarize and classify text (up to 4000 chars). Pay-per-call 0.02 USDC on Base via x402. Categories: news, opinion, technical, commercial, other. | 1 | $0.02 | 100.00% | $0.10 | 4 | Base |
| ● | Client Engine LC — private in-house AI (pay per call) | DescriptionPay-per-call AI on dedicated owned hardware (RTX 5090): code completion, review, refactor and test generation, reasoning, summarize, translate, embeddings, vector index and search, JSON repair, regex, SQL and curl helpers. USDC on Base via x402 exact, no account needed. | 23 | $0.005 | 100.00% | --- | --- | Base |
| ● | Agent402 Website Release & Offline Tools | DescriptionFive Base-USDC x402 developer resources: deterministic website release and x402 launch audits, a low-cost HTTPS preflight, and two offline toolkits. Public OpenAPI and x402 metadata are available on the service origin. | 2 | $5.99 | 100.00% | $0 | 0 | Base |
| ● | AISkills402 | DescriptionA store of tested Agent Skills (SKILL.md files) for Claude Code and other AI coding agents. An agent pays once per skill file in USDC on Base via x402 (CDP facilitator) and receives the file; re-downloads and new versions are free. Every skill is tested on real models before release. No account, no card, no API key. | 50 | $0.01 | 100.00% | $0 | 0 | Base |
| ● | ForgeMesh x402 Router | DescriptionPaid search API over a registry of x402 services, with filters for category, tag, health status and reputation score. | 1 | $0.001 | 100.00% | $0.006 | 6 | Base |
25 of 212 services ── category: AI ── all services
Measurement methodology
Page snapshot as of .