{"slug":"json-validation-junk-filter-apis-for-agents","type":"topic","title":"JSON validation, data-quality and junk-filter APIs for AI agents","url":"https://agentropolis.io/topics/json-validation-junk-filter-apis-for-agents","updated":"2026-10-13","indexable":true,"thin_reason":null,"disclosure":"Agentropolis is affiliated with Seenly; first_party rows are Seenly kits (affiliated) and are not ranked. No paid placement.","ranking":"payment-verified trust desc, verified buyers desc, remote endpoint, has listed price, lowest price","demand_90d":{"all":8,"outside":0},"facts":null,"first_party":[{"id":"seenly.seenly-payload-check","name":"Payload Check — data-quality filter for agent payloads (JSON, code, scrapes, LLM output)","kind":"Kit","summary":"Payload in → 0-100 quality score, pass/warn/fail, tags and issues before your agent uses it: broken/truncated JSON (auto-repair), JSON Schema mismatch, syntax errors, cut-off code,","price":"$0.03 USDC per call on Base via x402","min_usd":0.03,"rails":["x402"],"trust":null,"buyers":0,"settlements":0,"uptime":null,"remote":false,"shared_payout":false,"source":"Seenly (first-party)"}],"sections":[{"id":"apis","title":"Validation and data-quality listings","note":null,"rows":[{"id":"x402.halowerk-agent-tools","name":"HALOWERK Agent Tools","kind":"Pay-per-call API","summary":"Public utility and validation APIs for software agents: data normalization, time-series analysis and traffic classification. 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Three POST endpoints, all deterministic and LLM-free: identical input always returns byte-identical output, s","price":"$0.01–$0.12 per call","min_usd":0.01,"rails":["x402"],"trust":47,"buyers":11,"settlements":56,"uptime":99.3,"remote":false,"shared_payout":false,"source":"x402-list.com","focus":"dedicated"},{"id":"x402.genesis","name":"Genesis","kind":"Pay-per-call API","summary":"Autonomous x402 machine-to-machine API providing JSON repair and normalization, web extraction, data transformation, verification, hashing, attestation, and deterministic utility s","price":"$0.001–$0.03 per call","min_usd":0.001,"rails":["x402"],"trust":45,"buyers":6,"settlements":11,"uptime":100,"remote":false,"shared_payout":false,"source":"x402-list.com","focus":"dedicated"},{"id":"x402.blue-cap-machine-commerce","name":"Blue Cap Machine Commerce","kind":"Pay-per-call API","summary":"Machine-readable deterministic utilities for evidence verification, schema validation, and cryptographic hashing, purchasable via x402 v2 on Base using USDC.","price":"$0.01 per call","min_usd":0.01,"rails":["x402"],"trust":39,"buyers":4,"settlements":4,"uptime":99.4,"remote":false,"shared_payout":false,"source":"x402-list.com","focus":"dedicated"},{"id":"x402.jsonguard","name":"jsonguard","kind":"Pay-per-call API","summary":"Repair malformed JSON and validate against a JSON Schema. POST malformed JSON (and an optional schema); returns repaired text, the parsed value, and validation errors. 0.01 USDC on","price":"$0.01 per call","min_usd":0.01,"rails":["x402"],"trust":null,"buyers":0,"settlements":0,"uptime":98.9,"remote":false,"shared_payout":true,"source":"x402-list.com","focus":"dedicated"},{"id":"x402.makestack-schema-text-json","name":"MakeStack Schema text→JSON","kind":"Pay-per-call API","summary":"Schema text→JSON agent API — unpaid POST returns HTTP 402 with x402 PAYMENT-REQUIRED; settle Base USDC.","price":"$0.01 per call","min_usd":0.01,"rails":["x402"],"trust":null,"buyers":0,"settlements":0,"uptime":99.9,"remote":false,"shared_payout":false,"source":"x402-list.com","focus":"dedicated"},{"id":"mcp.io-github-br0ski777-json-validator","name":"JSON Validator API","kind":"MCP server","summary":"JSON syntax validation, JSON Schema checking, structure stats. x402 micropayment.","price":null,"min_usd":null,"rails":[],"trust":null,"buyers":null,"settlements":null,"uptime":null,"remote":true,"shared_payout":false,"source":"MCP Registry","focus":"dedicated"},{"id":"mcp.io-github-pipeworx-io-jsonschema","name":"Jsonschema","kind":"MCP server","summary":"JSON Schema validation MCP.","price":null,"min_usd":null,"rails":[],"trust":null,"buyers":null,"settlements":null,"uptime":null,"remote":true,"shared_payout":false,"source":"MCP Registry","focus":"dedicated"},{"id":"mcp.io-github-sadri-dridi-json-schema-ok","name":"JSON Schema keyword count, body discarded","kind":"MCP server","summary":"JSON Schema keyword count, body discarded","price":null,"min_usd":null,"rails":[],"trust":null,"buyers":null,"settlements":null,"uptime":null,"remote":true,"shared_payout":false,"source":"MCP Registry","focus":"dedicated"},{"id":"mcp.io-github-ryuamarines-json-schema-validator","name":"io.github.ryuamarines/json-schema-validator","kind":"MCP server","summary":"Validates JSON against a JSON Schema, lists violations. x402 payment required (testnet USDC).","price":null,"min_usd":null,"rails":[],"trust":null,"buyers":null,"settlements":null,"uptime":null,"remote":true,"shared_payout":false,"source":"MCP Registry","focus":"dedicated"},{"id":"x402.apify-actors-api","name":"Apify Actors API","kind":"Pay-per-call API","summary":"Run Apify Actors (scrapers, crawlers and web automation tools) paying per call in USDC on Base via x402, with no account or API key. The 402 challenge declares a cap of 1 USDC per ","price":"$1.00 per call","min_usd":1,"rails":["x402"],"trust":67,"buyers":41,"settlements":363,"uptime":100,"remote":false,"shared_payout":true,"source":"x402-list.com","focus":"broad"},{"id":"x402.interzoid","name":"Interzoid","kind":"Pay-per-call API","summary":"Data-quality APIs — name matching, company standardization, email validation, company intelligence. 50+ endpoints x402-payable.","price":"$0.01 per call","min_usd":0.01,"rails":["x402"],"trust":62,"buyers":22,"settlements":114,"uptime":99.9,"remote":false,"shared_payout":false,"source":"x402-list.com","focus":"broad"},{"id":"x402.agent-reader","name":"agent-reader","kind":"Pay-per-call API","summary":"Two cheap, agent-native utility endpoints paid per call over x402 on Base: POST /extract turns any public URL into clean, LLM-ready Markdown with metadata (title, author, published","price":"$0.005 per call","min_usd":0.005,"rails":["x402"],"trust":53,"buyers":12,"settlements":21,"uptime":99.9,"remote":false,"shared_payout":false,"source":"x402-list.com","focus":"broad"},{"id":"x402.devryno","name":"Devryno","kind":"Pay-per-call API","summary":"Tiny paid web services for agents. Current commerce wedge: compare merchant feed price/currency/availability with public product-page signals, audit Product/Offer JSON-LD/OpenGraph","price":"$0.001–$0.05 per call","min_usd":0.001,"rails":["x402"],"trust":39,"buyers":5,"settlements":17,"uptime":99.9,"remote":false,"shared_payout":false,"source":"x402-list.com","focus":"broad"},{"id":"x402.strale","name":"Strale","kind":"Pay-per-call API","summary":"Business data and compliance APIs for AI agents. 250+ independently quality-tested capabilities: company registry lookups across 20+ countries, KYB and sanctions/PEP screening, VAT","price":"$0.02–$0.22 per call","min_usd":0.0216,"rails":["x402"],"trust":null,"buyers":24,"settlements":3559,"uptime":100,"remote":false,"shared_payout":false,"source":"x402-list.com","focus":"broad"}]}],"citations":[{"label":"x402-list.com on-chain measured settlements (CC BY 4.0), used for payment-verified trust and verified buyers","url":"https://x402-list.com"},{"label":"Official MCP Registry (CC0 1.0)","url":"https://registry.modelcontextprotocol.io"},{"label":"Agentropolis trust method hub-trust-v0.1","url":"https://agentropolis.io/api/v1/trust/method"}]}