●

VERITY

Verification PAYMENT-READY

payment-ready until 2026-10-11

Real-time fact-checking agent. Verifies a claim against live web sources and returns a structured verdict with evidence and confidence. Pay per call in USDC on Base via x402: standard verify (0.10), deep multi-angle check (0.50), batch of up to 10 claims (0.75), natural-language agent endpoint with A2A and streaming (0.10). Also an MCP server (npx verity-mcp) with card credits.

Pay from $0.10 to $0.75 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.

listed 2026-10-04 · no on-chain settlement recorded yet

BASE URL https://verity.basechainlabs.com │ WEBSITE https://verity.basechainlabs.com │ ENDPOINTS 4 │ NETWORK Base │ ASSET USDC │ MEMBER SINCE 2026-10-04 │ MONITORED SINCE 2026-10-04

VERDICT

ranking generation 3

solid 84/100 #50 of 123 in Verification by measured score

What the score read on this service: status online, 100% uptime, latest daily rollup (no 30d window yet), 225ms response p95, x402 compliance 14 of 14, $0.1 price against the category, on-chain traction measured. Each of those is measured, and each is published in full below.

The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.

It is a score inside Verification, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 123 listings, this one among them. That set is wider than the 123 the position above is counted against, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.

Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.

ALTERNATIVES IN VERIFICATION

Other Verification services in this directory, ordered by the same measured score. The figures are ours: 30-day uptime from our own probes, 30-day settlement volume read on-chain (a conservative undercount, and null where we cannot measure it, never a zero).

Ranked alternative x402 services in the same category, with band, measured score, 30-day uptime and 30-day on-chain settlement volume
SERVICE	BAND	SCORE	UPTIME 30D	VOL 30D
scvd.store — evidence observatory for the x402 economy	strong	94	100%	$899.12
Rubric Protocol — Post-Quantum AI Attestation	solid	93	99.9%	$34.71
PHION Agent Services	solid	89	99.9%	$1.50
KushBitx AgentProof	solid	89	100%	$1.52
Public URL Check + SHA-256 - PennyBot	solid	89	---	$0

5 of 122 other ranked services in Verification

ASSESSMENT

updated 2h ago

The parts the verdict above is computed from, each with its proof. Click any chip. Measured values stay read-only; unknown is honest, and an unknown is never counted as a zero.

reliability 100%

uptime · latest daily rollup: -
uptime 7d: -
uptime 30d: -
uptime 90d: -
response p95: 225ms
avg response: 225ms
total checks: 1

Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.

compliance A (14/14)

14 of 14 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.10 to $0.75 (p87 in Verification)

price (min): $0.10
price (max): $0.75
category percentile (min): p87 in Verification
category percentile (max): p78 in Verification
endpoints / prices: 4 / 3
model: tiered
stability: 100%

risk clean

No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.

domain age: 282d
registrar: Dreamscape Networks International Pte Ltd
hosting: custom
domain created: 2025-12-26

Identity facts, not a risk score.

traction $0.00 30d · 0 buyers

volume 30d: $0.00
buyers 30d: 0
settlements 30d: 0
measured since: --- (start of our harvest window)
last settlement: ---
top buyer share: -
trend 7d vs 30d: -
networks: eip155:8453
volume all-time: $0
settlements all-time: 0
median settlement 30d: -
max settlement 30d: -
settled via: -

Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.

Top buyer share is part of the ranking score: a higher share lowers the traction part of the score, by up to half when one address holds all 30d volume.

WHAT IT DOES

ai-derived

No AI synthesis has been produced for this service yet.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD	PATH	PRICE	NETWORK	ASSET	402 CHANNEL
POST	/api/agent	$0.10	Base	USDC	header
GET	/api/batch-verify	$0.75	Base	USDC	header
GET	/api/deep-check	$0.50	Base	USDC	header
GET	/api/verify	$0.10	Base	USDC	header

4 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to GET /api/batch-verify returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request

curl -i 'https://verity.basechainlabs.com/api/batch-verify'

// 402 response (captured by monitor) · 4 payloads · click to expand

[
  {
    "error": "payment-required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x400d65bb174c546ed92f5d61ce21fbde96b8bacc",
        "amount": "100000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://verity.basechainlabs.com/api/verify",
      "mimeType": "application/json",
      "description": "Fact-checking with persistent memory — VERITY remembers prior claims your agent has checked and skips repeat lookups, saving tokens across sessions. Returns CURRENT/OUTDATED/DISPUTED/UNVERIFIABLE verdicts with confidence score, sources, and what changed. 0.10 USDC."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "query": "Verify: Is GPT-4 still the most capable OpenAI model?",
              "caller_id": "my-agent-id"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "status": "completed",
              "artifact": {
                "index": 0,
                "parts": [
                  {
                    "text": "{\"verdict\":\"OUTDATED\",\"confidence\":91,\"summary\":\"GPT-4 has been superseded by GPT-4o and o3 models as of 2025.\",\"what_changed\":\"OpenAI released GPT-4o in May 2024 and o3 in late 2024, both outperforming GPT-4.\",\"sources\":[{\"url\":\"https://openai.com/blog/...\",\"title\":\"...\",\"published_date\":\"2025-01\",\"supports\":\"CONTRADICTS\"}]}",
                    "type": "text"
                  }
                ]
              }
            }
          }
        },
        "tags": [
          "fact-check",
          "verification",
          "data-freshness",
          "hallucination",
          "ai-verification"
        ],
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "properties": {
                "body": {
                  "required": [
                    "query"
                  ],
                  "properties": {
                    "query": {
                      "type": "string",
                      "description": "The claim, URL, or content to verify. E.g. 'Is OpenAI still valued at $157B?' or 'https://example.com/article'"
                    },
                    "caller_id": {
                      "type": "string",
                      "description": "Optional agent or user ID for persistent memory."
                    }
                  }
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object",
                  "properties": {
                    "status": {
                      "type": "string"
                    },
                    "tokens": {
                      "type": "number"
                    },
                    "artifact": {
                      "type": "object"
                    }
                  }
                }
              }
            }
          }
        },
        "iconUrl": "https://verity.basechainlabs.com/verity-logo.jpg",
        "serviceName": "VERITY — Claim Verification"
      }
    },
    "x402Version": 2
  },
  {
    "error": "payment-required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x400d65bb174c546ed92f5d61ce21fbde96b8bacc",
        "amount": "500000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://verity.basechainlabs.com/api/deep-check",
      "mimeType": "application/json",
      "description": "Deep multi-angle fact-checking with persistent memory — VERITY remembers prior verdicts so your agent stops re-verifying confirmed claims. 5+ search angles, advanced Tavily depth, cross-referenced sources for high-stakes verification. 0.50 USDC."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "query": "Deep check: Is climate change causing more frequent Category 5 hurricanes?",
              "caller_id": "my-agent-id"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "status": "completed",
              "artifact": {
                "index": 0,
                "parts": [
                  {
                    "text": "{\"verdict\":\"DISPUTED\",\"confidence\":58,\"summary\":\"Scientific consensus confirms increased intensity but frequency data is debated.\",\"sources\":[...],\"what_changed\":\"Two major studies in 2025 reached conflicting conclusions on frequency trends.\"}",
                    "type": "text"
                  }
                ]
              }
            }
          }
        },
        "tags": [
          "fact-check",
          "verification",
          "data-freshness",
          "hallucination",
          "ai-verification"
        ],
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "properties": {
                "body": {
                  "required": [
                    "query"
                  ],
                  "properties": {
                    "query": {
                      "type": "string",
                      "description": "The claim to deeply verify across multiple angles and authoritative sources"
                    },
                    "caller_id": {
                      "type": "string",
                      "description": "Optional agent or user ID for persistent memory."
                    }
                  }
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object",
                  "properties": {
                    "status": {
                      "type": "string"
                    },
                    "tokens": {
                      "type": "number"
                    },
                    "artifact": {
                      "type": "object"
                    }
                  }
                }
              }
            }
          }
        },
        "iconUrl": "https://verity.basechainlabs.com/verity-logo.jpg",
        "serviceName": "VERITY — Deep Fact Check"
      }
    },
    "x402Version": 2
  },
  {
    "error": "payment-required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x400d65bb174c546ed92f5d61ce21fbde96b8bacc",
        "amount": "750000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://verity.basechainlabs.com/api/batch-verify",
      "mimeType": "application/json",
      "description": "Batch fact-checking with persistent memory — verify up to 10 claims per call. VERITY remembers prior checks so repeat claims aren't re-verified. Use for content audits and fact-check pipelines. 0.75 USDC for the batch."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "query": "[\"GPT-4 is OpenAIs most capable model\", \"The iPhone 15 was released in 2024\", \"Python is the most popular programming language\"]",
              "caller_id": "my-agent-id"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "status": "completed",
              "artifact": {
                "index": 0,
                "parts": [
                  {
                    "text": "[{\"claim\":\"...\",\"verdict\":\"OUTDATED\",\"confidence\":88},{\"claim\":\"...\",\"verdict\":\"CURRENT\",\"confidence\":75}]",
                    "type": "text"
                  }
                ]
              }
            }
          }
        },
        "tags": [
          "fact-check",
          "verification",
          "data-freshness",
          "hallucination",
          "ai-verification"
        ],
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "properties": {
                "body": {
                  "required": [
                    "query"
                  ],
                  "properties": {
                    "query": {
                      "type": "string",
                      "description": "JSON array of up to 10 claims to verify, or a newline-separated list"
                    },
                    "caller_id": {
                      "type": "string",
                      "description": "Optional agent or user ID for persistent memory."
                    }
                  }
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object",
                  "properties": {
                    "status": {
                      "type": "string"
                    },
                    "tokens": {
                      "type": "number"
                    },
                    "artifact": {
                      "type": "object"
                    }
                  }
                }
              }
            }
          }
        },
        "iconUrl": "https://verity.basechainlabs.com/verity-logo.jpg",
        "serviceName": "VERITY — Batch Verify"
      }
    },
    "x402Version": 2
  },
  {
    "error": "payment-required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x400d65bb174c546ed92f5d61ce21fbde96b8bacc",
        "amount": "100000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://verity.basechainlabs.com/api/agent",
      "mimeType": "application/json",
      "description": "Conversational fact-checking with persistent memory — VERITY remembers what your agent has checked across sessions, skipping repeat lookups. Returns CURRENT/OUTDATED/DISPUTED/UNVERIFIABLE verdicts with confidence scores and sources. 0.10 USDC/call."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "query": "Is GPT-4 still the most capable AI model?",
              "caller_id": "my-agent-id"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "status": "completed",
              "artifact": {
                "index": 0,
                "parts": [
                  {
                    "text": "{\"verdict\":\"OUTDATED\",\"confidence\":91,\"summary\":\"...\",\"sources\":[...]}",
                    "type": "text"
                  }
                ]
              }
            }
          }
        },
        "tags": [
          "fact-check",
          "verification",
          "data-freshness",
          "hallucination",
          "claim-check"
        ],
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "properties": {
                "body": {
                  "required": [
                    "query"
                  ],
                  "properties": {
                    "query": {
                      "type": "string",
                      "description": "Claim, URL, or question to verify. E.g. 'Is X still true?', 'Check this URL: https://...'."
                    },
                    "caller_id": {
                      "type": "string",
                      "description": "Optional stable ID for persistent memory across verification sessions."
                    }
                  }
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object",
                  "properties": {
                    "status": {
                      "type": "string"
                    },
                    "tokens": {
                      "type": "number"
                    },
                    "artifact": {
                      "type": "object"
                    }
                  }
                }
              }
            }
          }
        },
        "iconUrl": "https://verity.basechainlabs.com/verity-logo.jpg",
        "serviceName": "VERITY"
      }
    },
    "x402Version": 2
  }
]

OVER TIME

All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/verity/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.

UPTIME

30D UPTIME 100%

RESPONSE TIME

AVG RESP 213ms

PRICE (captured 402, USD)

Median across 4 endpoints. Use the selector to isolate one.

SUB-SCORES (uptime + x402 compliance)

checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression

VOLUME (on-chain settlement, USD)

DISTINCT BUYERS

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-10-04 · last up 2026-10-04

402 payload captured
accepts[] array present
payTo address recoverable
payTo at accepts[0].payTo (conformant shape)
payTo is a valid on-chain address
atomic price declared
atomic price in a sane range
asset (token) address declared
network resolves to CAIP-2
payment scheme declared
served over HTTPS
declares the current x402 version (2)
EIP-712 domain parameters present on every EVM entry
x402 v2 envelope delivered in the payment-required header

SITE PILLARS

homepage reachable
openapi doc
pricing page
llms.txt
robots.txt
terms page

recent checks (7) live · click to expand

TIME STATUS RESP CAUSE

23:49:00 UTC ● OK 83ms

23:33:01 UTC ● SLOW 407ms

23:17:01 UTC ● OK 260ms

23:01:00 UTC ● OK 137ms

22:45:00 UTC ● OK 95ms

22:29:01 UTC ● OK 286ms

22:13:01 UTC ● OK 225ms

EMBED THIS BADGE

Show that VERITY is monitored on x402-list. Paste this on your site or README, it links back to this live listing.

status

VERITY uptime on x402-list — live uptime

// HTML

<a href="https://x402-list.com/services/verity?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/verity.svg" alt="VERITY listed on x402-list" height="28">
</a>

// Markdown

[![VERITY on x402-list](https://x402-list.com/badge/verity.svg)](https://x402-list.com/services/verity?utm_source=badge&utm_medium=referral&utm_campaign=embed)

// HTML · live uptime variant

<a href="https://x402-list.com/services/verity?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/verity.svg?data=uptime" alt="VERITY uptime on x402-list" height="28">
</a>

RUN THIS SERVICE?

Keep this listing accurate: propose changes to the name, description, website, category or add new endpoints to monitor. Ownership is verified with a domain proof and every change is reviewed manually; measured data stays read-only.

[ update this listing ]

Earn the verified tier: x402list pays a real call to this endpoint and, if it delivers, the service is delivery-verified. The fee covers the cost of the probe, not the badge; there is no refund if the call does not deliver. Agent and API only, no in-browser signing. See /api.

[ verify this service ($0.25) ]

To request delisting, email info@x402-list.com or update your listing at /services/verity/update.